8 CSS Navbar Designs06 / 08

CSS + JSMIT licensed

Full Screen Overlay CSS Menu

A creative-agency full-screen overlay menu navbar UI for Kairos/Studio — proving that hamburger nav can be the headline interaction instead of an afterthought. Minimal dark header with a Space Mono "Kairos/Studio" wordmark (lime slash) and an asymmetric three-line hamburger button (28/18/28 px). Clicking the burger triggers a two-panel curtain wipe (panel 1 #09090b + panel 2 #0f0f11 with a 0.05s delay) that fills the demo, then reveals five giant Bebas Neue stacked menu items (01 Work / 02 Studio / 03 Services / 04 Journal / 05 Contact) that slide up from below with staggered 50ms-step delays. A right sidebar panel fades in showing selected work links, a pulsing-lime "Available for projects" status dot, and four monospace social links. Hover any item: text turns lime, a lime arrow slides in. Closing reverses the curtain. The demo page itself carries a giant "KAIROS" outlined-stroke background letterform, a corner deco block, a randomised 5x5 dot grid, and a "We craft the unusual." hero with a lime CTA. Bebas Neue + Outfit + Space Mono. Best for creative agency sites, design studios, motion/portfolio brands, asymmetric editorial sites, full-bleed creative landings.

Published Updated

Live Demo
Try it

This is a full-page demo — interact inside the frame above, or open it in the playground for the full-screen experience.

The code

<section class="nb-ovl" aria-label="Kairos Studio fullscreen overlay menu demo">
  <div class="overlay" data-nb-ovl-overlay aria-hidden="true">
    <div class="overlay-panel" aria-hidden="true"></div>
    <div class="overlay-panel overlay-panel-2" aria-hidden="true"></div>
    <div class="overlay-content">
      <nav class="overlay-nav" aria-label="Overlay menu">
        <div class="overlay-counter">NAVIGATION — 05 LINKS</div>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">01</span>
            <span class="item-label">Work</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">02</span>
            <span class="item-label">Studio</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">03</span>
            <span class="item-label">Services</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">04</span>
            <span class="item-label">Journal</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">05</span>
            <span class="item-label">Contact</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
      </nav>

      <aside class="overlay-sidebar">
        <div>
          <div class="sidebar-block">
            <div class="sidebar-label">Selected Work</div>
            <a href="#" class="sidebar-link">Brand Identity, Oasis Collective</a>
            <a href="#" class="sidebar-link">Motion Design, Volta Studio</a>
            <a href="#" class="sidebar-link">Web Design, Meridian Labs</a>
            <a href="#" class="sidebar-link">Campaign, Norda Athletics</a>
          </div>
        </div>
        <div>
          <div class="sidebar-block">
            <div class="sidebar-label">Currently</div>
            <div class="sidebar-status">
              <div class="status-dot" aria-hidden="true"></div>
              Available for projects — Q3 2026
            </div>
          </div>
          <div class="sidebar-block sidebar-block-spaced">
            <div class="sidebar-label">Follow</div>
            <div class="sidebar-social">
              <a href="#" class="social-link">Twitter</a>
              <a href="#" class="social-link">Instagram</a>
              <a href="#" class="social-link">Dribbble</a>
              <a href="#" class="social-link">LinkedIn</a>
            </div>
          </div>
        </div>
      </aside>
    </div>
  </div>

  <header>
    <a href="#" class="brand">Kairos<span class="slash">/</span>Studio</a>
    <div class="header-spacer"></div>
    <button class="menu-btn" type="button" data-nb-ovl-toggle aria-label="Open menu" aria-expanded="false">
      <span class="menu-line l1" aria-hidden="true"></span>
      <span class="menu-line l2" aria-hidden="true"></span>
      <span class="menu-line l3" aria-hidden="true"></span>
    </button>
  </header>

  <div class="page">
    <div class="bg-text" aria-hidden="true">KAIROS</div>
    <div class="corner-deco" aria-hidden="true">
      DESIGN STUDIO<br>
      EST. 2019<br>
      BERLIN — NYC
    </div>
    <div class="grid-deco" data-nb-ovl-dotgrid aria-hidden="true"></div>

    <div class="hero-content">
      <div class="hero-caption">
        <div>
          <div class="h-eyebrow">
            <div class="h-eyebrow-line" aria-hidden="true"></div>
            <div class="h-eyebrow-text">Selected work — 2026</div>
          </div>
          <h1 class="h-title">We craft<br>the un<span class="accent">usual.</span></h1>
        </div>
        <div class="h-right">
          <p class="h-desc">Click the hamburger above to trigger a full-screen overlay — bold typography slides in with staggered reveals and the menu becomes the moment.</p>
          <button class="h-cta" type="button" data-nb-ovl-open>
            Open the menu
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" aria-hidden="true"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg>
          </button>
        </div>
      </div>
    </div>
  </div>
</section>
/* ─── 06 Kairos/Studio — fullscreen overlay menu navbar UI ─────── */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Outfit:wght@300;400;500;600&family=Space+Mono:ital,wght@0,400;1,400&display=swap');

.nb-ovl {
  --nb-ovl-void: #09090b;
  --nb-ovl-lime: #c8f135;
  --nb-ovl-lime-dim: #9bb822;
  --nb-ovl-off-white: #f0efeb;
  --nb-ovl-warm-grey: #a09fa0;
  --nb-ovl-border: rgba(240,239,235,0.1);
  position: relative;
  width: 100%;
  min-height: 720px;
  background: var(--nb-ovl-void);
  color: var(--nb-ovl-off-white);
  font-family: 'Outfit', sans-serif;
  overflow: hidden;
  box-sizing: border-box;
}

.nb-ovl *,
.nb-ovl *::before,
.nb-ovl *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.nb-ovl header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding: 1.5rem 2.5rem;
  display: flex;
  align-items: center;
  mix-blend-mode: difference;
}

.nb-ovl .brand {
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--nb-ovl-off-white);
  text-decoration: none;
  z-index: 10;
  position: relative;
}

.nb-ovl .brand .slash {
  color: var(--nb-ovl-lime);
  margin: 0 2px;
}

.nb-ovl .header-spacer {
  flex: 1;
}

.nb-ovl .menu-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: flex-end;
  z-index: 300;
  position: relative;
}

.nb-ovl .menu-line {
  display: block;
  height: 1.5px;
  background: var(--nb-ovl-off-white);
  border-radius: 1px;
  transition: transform 0.4s cubic-bezier(0.23,1,0.32,1), width 0.3s ease, opacity 0.2s;
}

.nb-ovl .l1 {
  width: 28px;
  margin-bottom: 6px;
}

.nb-ovl .l2 {
  width: 18px;
  margin-bottom: 6px;
}

.nb-ovl .l3 {
  width: 28px;
}

.nb-ovl .menu-btn.open .l1 {
  transform: translateY(7.5px) rotate(45deg);
  width: 28px;
}

.nb-ovl .menu-btn.open .l2 {
  opacity: 0;
  transform: scaleX(0);
}

.nb-ovl .menu-btn.open .l3 {
  transform: translateY(-7.5px) rotate(-45deg);
  width: 28px;
}

.nb-ovl .overlay {
  position: absolute;
  inset: 0;
  z-index: 150;
  pointer-events: none;
  overflow: hidden;
}

.nb-ovl .overlay-panel {
  position: absolute;
  inset: 0;
  background: var(--nb-ovl-void);
  transform: translateY(-100%);
  transition: transform 0.65s cubic-bezier(0.86,0,0.07,1);
}

.nb-ovl .overlay-panel-2 {
  background: #0f0f11;
  transition-delay: 0.05s;
}

.nb-ovl .overlay.open .overlay-panel {
  transform: translateY(0);
}

.nb-ovl .overlay.open {
  pointer-events: all;
}

.nb-ovl .overlay:not(.open) .overlay-panel {
  transition: transform 0.5s cubic-bezier(0.86,0,0.07,1);
  transform: translateY(-100%);
}

.nb-ovl .overlay.closing .overlay-panel {
  transform: translateY(-100%);
}

.nb-ovl .overlay.closing .overlay-panel-2 {
  transition-delay: 0.05s;
}

.nb-ovl .overlay-content {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr 340px;
  opacity: 0;
  transition: opacity 0.3s 0.2s;
  pointer-events: none;
}

.nb-ovl .overlay.open .overlay-content {
  opacity: 1;
  pointer-events: all;
}

.nb-ovl .overlay.closing .overlay-content {
  opacity: 0;
  transition-delay: 0s;
}

.nb-ovl .overlay-nav {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 4rem;
  border-right: 1px solid var(--nb-ovl-border);
  overflow: hidden;
}

.nb-ovl .overlay-counter {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: rgba(240,239,235,0.25);
  margin-bottom: 3rem;
}

.nb-ovl .menu-item {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  text-decoration: none;
  overflow: hidden;
  padding: 0.3rem 0;
  cursor: pointer;
  position: relative;
}

.nb-ovl .menu-item-inner {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  transform: translateY(100%);
  transition: transform 0.6s cubic-bezier(0.23,1,0.32,1);
  width: 100%;
}

.nb-ovl .overlay.open .menu-item:nth-child(2) .menu-item-inner {
  transition-delay: 0.15s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(3) .menu-item-inner {
  transition-delay: 0.20s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(4) .menu-item-inner {
  transition-delay: 0.25s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(5) .menu-item-inner {
  transition-delay: 0.30s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(6) .menu-item-inner {
  transition-delay: 0.35s;
  transform: translateY(0);
}

.nb-ovl .overlay.closing .menu-item .menu-item-inner {
  transform: translateY(-100%);
  transition-delay: 0s !important;
  transition-duration: 0.3s;
}

.nb-ovl .item-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  color: rgba(240,239,235,0.3);
  letter-spacing: 0.1em;
  flex-shrink: 0;
  margin-bottom: 4px;
  align-self: flex-end;
}

.nb-ovl .item-label {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(4rem, 8vw, 8rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--nb-ovl-off-white);
  line-height: 0.9;
  transition: color 0.2s;
  position: relative;
}

.nb-ovl .item-arrow {
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.2s, transform 0.2s;
  color: var(--nb-ovl-lime);
  font-size: 2rem;
  align-self: center;
  flex-shrink: 0;
}

.nb-ovl .menu-item:hover .item-label {
  color: var(--nb-ovl-lime);
}

.nb-ovl .menu-item:hover .item-num {
  color: var(--nb-ovl-lime);
}

.nb-ovl .menu-item:hover .item-arrow {
  opacity: 1;
  transform: translateX(0);
}

.nb-ovl .item-line {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--nb-ovl-border);
  width: 100%;
}

.nb-ovl .overlay-sidebar {
  padding: 6rem 2.5rem 3rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.4s 0.4s, transform 0.4s 0.4s;
}

.nb-ovl .overlay.open .overlay-sidebar {
  opacity: 1;
  transform: translateX(0);
}

.nb-ovl .overlay.closing .overlay-sidebar {
  opacity: 0;
  transform: translateX(20px);
  transition-delay: 0s;
}

.nb-ovl .sidebar-block {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nb-ovl .sidebar-block-spaced {
  margin-top: 1.5rem;
}

.nb-ovl .sidebar-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(240,239,235,0.3);
  margin-bottom: 0.5rem;
}

.nb-ovl .sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: rgba(240,239,235,0.6);
  text-decoration: none;
  transition: color 0.15s;
  padding: 3px 0;
}

.nb-ovl .sidebar-link:hover {
  color: var(--nb-ovl-off-white);
}

.nb-ovl .sidebar-link::before {
  content: '→';
  color: var(--nb-ovl-lime);
  font-size: 0.7rem;
}

.nb-ovl .sidebar-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: rgba(240,239,235,0.5);
}

.nb-ovl .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nb-ovl-lime);
  box-shadow: 0 0 8px var(--nb-ovl-lime);
  flex-shrink: 0;
  animation: nb-ovl-pulse 2s ease-in-out infinite;
}

@keyframes nb-ovl-pulse {
  0%,
    100% {
    box-shadow: 0 0 8px var(--nb-ovl-lime);
  }

  50% {
    box-shadow: 0 0 16px var(--nb-ovl-lime);
  }
}

.nb-ovl .sidebar-social {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nb-ovl .social-link {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: rgba(240,239,235,0.35);
  text-decoration: none;
  transition: color 0.15s;
}

.nb-ovl .social-link:hover {
  color: var(--nb-ovl-lime);
}

.nb-ovl .page {
  min-height: 720px;
  position: relative;
  overflow: hidden;
}

.nb-ovl .page::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.05'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.nb-ovl .bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(12rem, 25vw, 28rem);
  font-weight: 400;
  color: transparent;
  -webkit-text-stroke: 1px rgba(240,239,235,0.04);
  letter-spacing: 0.05em;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  line-height: 1;
}

.nb-ovl .hero-content {
  position: relative;
  z-index: 1;
  min-height: 720px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 4rem 3rem;
}

.nb-ovl .hero-caption {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3rem;
  align-items: end;
  max-width: 1200px;
}

.nb-ovl .h-eyebrow {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 1rem;
}

.nb-ovl .h-eyebrow-line {
  width: 40px;
  height: 1.5px;
  background: var(--nb-ovl-lime);
}

.nb-ovl .h-eyebrow-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: rgba(240,239,235,0.45);
  text-transform: uppercase;
}

.nb-ovl .h-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(4rem, 10vw, 12rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 0.9;
  color: var(--nb-ovl-off-white);
}

.nb-ovl .h-title .accent {
  color: var(--nb-ovl-lime);
}

.nb-ovl .h-right {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 1.5rem;
  padding-bottom: 0.5rem;
}

.nb-ovl .h-desc {
  font-size: 0.9rem;
  color: rgba(240,239,235,0.5);
  line-height: 1.65;
  max-width: 36ch;
}

.nb-ovl .h-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nb-ovl-void);
  background: var(--nb-ovl-lime);
  border: none;
  padding: 12px 24px;
  border-radius: 100px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  width: fit-content;
  font-family: inherit;
}

.nb-ovl .h-cta:hover {
  background: #d4f850;
  transform: translateX(4px);
}

.nb-ovl .corner-deco {
  position: absolute;
  top: 2rem;
  right: 2rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: rgba(240,239,235,0.15);
  text-align: right;
  line-height: 2;
  z-index: 1;
  pointer-events: none;
}

.nb-ovl .grid-deco {
  position: absolute;
  bottom: 3rem;
  right: 3rem;
  display: grid;
  grid-template-columns: repeat(5, 6px);
  grid-template-rows: repeat(5, 6px);
  gap: 4px;
  z-index: 1;
  pointer-events: none;
}

.nb-ovl .grid-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(240,239,235,0.12);
}

.nb-ovl .grid-dot.lit {
  background: var(--nb-ovl-lime);
  opacity: 0.6;
}

@media (max-width: 768px) {
  .nb-ovl .hero-caption {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .nb-ovl .overlay-content {
    grid-template-columns: 1fr;
  }

  .nb-ovl .overlay-sidebar {
    display: none;
  }

  .nb-ovl .overlay-nav {
    padding: 6rem 2rem;
  }

  .nb-ovl .item-label {
    font-size: clamp(3rem, 12vw, 6rem);
  }

  .nb-ovl header {
    padding: 1rem 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nb-ovl .overlay-panel,
    .nb-ovl .menu-item-inner,
    .nb-ovl .overlay-sidebar,
    .nb-ovl .status-dot,
    .nb-ovl .menu-line {
    transition: none !important;
    animation: none !important;
  }
}
(() => {
  // Scoped fullscreen-overlay wiring. Drops the source mock's
  // `document.body.style.overflow = 'hidden'` since the embedded
  // wrapper isn't the viewport. Escape-to-close listener bound to
  // the wrapper, so two demos can coexist on one page.
  const root = document.querySelector('.nb-ovl');
  if (!root) return;
  const overlay = root.querySelector('[data-nb-ovl-overlay]');
  const toggle = root.querySelector('[data-nb-ovl-toggle]');
  const opener = root.querySelector('[data-nb-ovl-open]');
  const dotGrid = root.querySelector('[data-nb-ovl-dotgrid]');
  if (!overlay || !toggle) return;

  // Build the 5x5 dot grid once.
  if (dotGrid && dotGrid.childElementCount === 0) {
    for (let i = 0; i < 25; i++) {
      const d = document.createElement('div');
      d.className = 'grid-dot' + (Math.random() > 0.7 ? ' lit' : '');
      dotGrid.appendChild(d);
    }
  }

  let isOpen = false;
  function openMenu() {
    isOpen = true;
    overlay.classList.remove('closing');
    overlay.classList.add('open');
    toggle.classList.add('open');
    toggle.setAttribute('aria-expanded', 'true');
    overlay.setAttribute('aria-hidden', 'false');
  }
  function closeMenu() {
    if (!isOpen) return;
    isOpen = false;
    overlay.classList.add('closing');
    toggle.classList.remove('open');
    toggle.setAttribute('aria-expanded', 'false');
    overlay.setAttribute('aria-hidden', 'true');
    setTimeout(() => {
      overlay.classList.remove('open', 'closing');
    }, 650);
  }

  toggle.addEventListener('click', () => { isOpen ? closeMenu() : openMenu(); });
  if (opener) opener.addEventListener('click', openMenu);

  // Close on any overlay menu item click.
  root.querySelectorAll('[data-nb-ovl-link]').forEach((link) => {
    link.addEventListener('click', (e) => {
      e.preventDefault();
      closeMenu();
    });
  });

  // Escape closes (only when overlay is open). Listener on wrapper so
  // multiple demos don't all close on one keypress.
  root.addEventListener('keydown', (e) => {
    if (e.key === 'Escape' && isOpen) closeMenu();
  });

  // Subtle dot animation, scoped.
  let dotTimer = null;
  if (dotGrid) {
    dotTimer = setInterval(() => {
      const dots = dotGrid.querySelectorAll('.grid-dot');
      if (!dots.length) return;
      const idx = Math.floor(Math.random() * dots.length);
      dots[idx].classList.toggle('lit');
    }, 800);
    root._nbOvlDotTimer = dotTimer;
  }
})();
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS Navbar Design from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: Full Screen Overlay CSS Menu
Source: https://codefronts.com/navigation/css-navbars/full-screen-overlay-css-menu/

A creative-agency full-screen overlay menu navbar UI for Kairos/Studio — proving that hamburger nav can be the headline interaction instead of an afterthought. Minimal dark header with a Space Mono "Kairos/Studio" wordmark (lime slash) and an asymmetric three-line hamburger button (28/18/28 px). Clicking the burger triggers a two-panel curtain wipe (panel 1 #09090b + panel 2 #0f0f11 with a 0.05s delay) that fills the demo, then reveals five giant Bebas Neue stacked menu items (01 Work / 02 Studio / 03 Services / 04 Journal / 05 Contact) that slide up from below with staggered 50ms-step delays. A right sidebar panel fades in showing selected work links, a pulsing-lime "Available for projects" status dot, and four monospace social links. Hover any item: text turns lime, a lime arrow slides in. Closing reverses the curtain. The demo page itself carries a giant "KAIROS" outlined-stroke background letterform, a corner deco block, a randomised 5x5 dot grid, and a "We craft the unusual." hero with a lime CTA. Bebas Neue + Outfit + Space Mono. Best for creative agency sites, design studios, motion/portfolio brands, asymmetric editorial sites, full-bleed creative landings.
## HTML
```html
<section class="nb-ovl" aria-label="Kairos Studio fullscreen overlay menu demo">
  <div class="overlay" data-nb-ovl-overlay aria-hidden="true">
    <div class="overlay-panel" aria-hidden="true"></div>
    <div class="overlay-panel overlay-panel-2" aria-hidden="true"></div>
    <div class="overlay-content">
      <nav class="overlay-nav" aria-label="Overlay menu">
        <div class="overlay-counter">NAVIGATION — 05 LINKS</div>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">01</span>
            <span class="item-label">Work</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">02</span>
            <span class="item-label">Studio</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">03</span>
            <span class="item-label">Services</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">04</span>
            <span class="item-label">Journal</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
        <a href="#" class="menu-item" data-nb-ovl-link>
          <span class="item-line" aria-hidden="true"></span>
          <span class="menu-item-inner">
            <span class="item-num">05</span>
            <span class="item-label">Contact</span>
            <span class="item-arrow" aria-hidden="true">→</span>
          </span>
        </a>
      </nav>

      <aside class="overlay-sidebar">
        <div>
          <div class="sidebar-block">
            <div class="sidebar-label">Selected Work</div>
            <a href="#" class="sidebar-link">Brand Identity, Oasis Collective</a>
            <a href="#" class="sidebar-link">Motion Design, Volta Studio</a>
            <a href="#" class="sidebar-link">Web Design, Meridian Labs</a>
            <a href="#" class="sidebar-link">Campaign, Norda Athletics</a>
          </div>
        </div>
        <div>
          <div class="sidebar-block">
            <div class="sidebar-label">Currently</div>
            <div class="sidebar-status">
              <div class="status-dot" aria-hidden="true"></div>
              Available for projects — Q3 2026
            </div>
          </div>
          <div class="sidebar-block sidebar-block-spaced">
            <div class="sidebar-label">Follow</div>
            <div class="sidebar-social">
              <a href="#" class="social-link">Twitter</a>
              <a href="#" class="social-link">Instagram</a>
              <a href="#" class="social-link">Dribbble</a>
              <a href="#" class="social-link">LinkedIn</a>
            </div>
          </div>
        </div>
      </aside>
    </div>
  </div>

  <header>
    <a href="#" class="brand">Kairos<span class="slash">/</span>Studio</a>
    <div class="header-spacer"></div>
    <button class="menu-btn" type="button" data-nb-ovl-toggle aria-label="Open menu" aria-expanded="false">
      <span class="menu-line l1" aria-hidden="true"></span>
      <span class="menu-line l2" aria-hidden="true"></span>
      <span class="menu-line l3" aria-hidden="true"></span>
    </button>
  </header>

  <div class="page">
    <div class="bg-text" aria-hidden="true">KAIROS</div>
    <div class="corner-deco" aria-hidden="true">
      DESIGN STUDIO<br>
      EST. 2019<br>
      BERLIN — NYC
    </div>
    <div class="grid-deco" data-nb-ovl-dotgrid aria-hidden="true"></div>

    <div class="hero-content">
      <div class="hero-caption">
        <div>
          <div class="h-eyebrow">
            <div class="h-eyebrow-line" aria-hidden="true"></div>
            <div class="h-eyebrow-text">Selected work — 2026</div>
          </div>
          <h1 class="h-title">We craft<br>the un<span class="accent">usual.</span></h1>
        </div>
        <div class="h-right">
          <p class="h-desc">Click the hamburger above to trigger a full-screen overlay — bold typography slides in with staggered reveals and the menu becomes the moment.</p>
          <button class="h-cta" type="button" data-nb-ovl-open>
            Open the menu
            <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" aria-hidden="true"><line x1="5" y1="12" x2="19" y2="12"/><polyline points="12 5 19 12 12 19"/></svg>
          </button>
        </div>
      </div>
    </div>
  </div>
</section>
```
## CSS
```css
/* ─── 06 Kairos/Studio — fullscreen overlay menu navbar UI ─────── */

@import url('https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Outfit:wght@300;400;500;600&family=Space+Mono:ital,wght@0,400;1,400&display=swap');

.nb-ovl {
  --nb-ovl-void: #09090b;
  --nb-ovl-lime: #c8f135;
  --nb-ovl-lime-dim: #9bb822;
  --nb-ovl-off-white: #f0efeb;
  --nb-ovl-warm-grey: #a09fa0;
  --nb-ovl-border: rgba(240,239,235,0.1);
  position: relative;
  width: 100%;
  min-height: 720px;
  background: var(--nb-ovl-void);
  color: var(--nb-ovl-off-white);
  font-family: 'Outfit', sans-serif;
  overflow: hidden;
  box-sizing: border-box;
}

.nb-ovl *,
.nb-ovl *::before,
.nb-ovl *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.nb-ovl header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding: 1.5rem 2.5rem;
  display: flex;
  align-items: center;
  mix-blend-mode: difference;
}

.nb-ovl .brand {
  font-family: 'Space Mono', monospace;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--nb-ovl-off-white);
  text-decoration: none;
  z-index: 10;
  position: relative;
}

.nb-ovl .brand .slash {
  color: var(--nb-ovl-lime);
  margin: 0 2px;
}

.nb-ovl .header-spacer {
  flex: 1;
}

.nb-ovl .menu-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 0;
  align-items: flex-end;
  z-index: 300;
  position: relative;
}

.nb-ovl .menu-line {
  display: block;
  height: 1.5px;
  background: var(--nb-ovl-off-white);
  border-radius: 1px;
  transition: transform 0.4s cubic-bezier(0.23,1,0.32,1), width 0.3s ease, opacity 0.2s;
}

.nb-ovl .l1 {
  width: 28px;
  margin-bottom: 6px;
}

.nb-ovl .l2 {
  width: 18px;
  margin-bottom: 6px;
}

.nb-ovl .l3 {
  width: 28px;
}

.nb-ovl .menu-btn.open .l1 {
  transform: translateY(7.5px) rotate(45deg);
  width: 28px;
}

.nb-ovl .menu-btn.open .l2 {
  opacity: 0;
  transform: scaleX(0);
}

.nb-ovl .menu-btn.open .l3 {
  transform: translateY(-7.5px) rotate(-45deg);
  width: 28px;
}

.nb-ovl .overlay {
  position: absolute;
  inset: 0;
  z-index: 150;
  pointer-events: none;
  overflow: hidden;
}

.nb-ovl .overlay-panel {
  position: absolute;
  inset: 0;
  background: var(--nb-ovl-void);
  transform: translateY(-100%);
  transition: transform 0.65s cubic-bezier(0.86,0,0.07,1);
}

.nb-ovl .overlay-panel-2 {
  background: #0f0f11;
  transition-delay: 0.05s;
}

.nb-ovl .overlay.open .overlay-panel {
  transform: translateY(0);
}

.nb-ovl .overlay.open {
  pointer-events: all;
}

.nb-ovl .overlay:not(.open) .overlay-panel {
  transition: transform 0.5s cubic-bezier(0.86,0,0.07,1);
  transform: translateY(-100%);
}

.nb-ovl .overlay.closing .overlay-panel {
  transform: translateY(-100%);
}

.nb-ovl .overlay.closing .overlay-panel-2 {
  transition-delay: 0.05s;
}

.nb-ovl .overlay-content {
  position: absolute;
  inset: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr 340px;
  opacity: 0;
  transition: opacity 0.3s 0.2s;
  pointer-events: none;
}

.nb-ovl .overlay.open .overlay-content {
  opacity: 1;
  pointer-events: all;
}

.nb-ovl .overlay.closing .overlay-content {
  opacity: 0;
  transition-delay: 0s;
}

.nb-ovl .overlay-nav {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 6rem 4rem;
  border-right: 1px solid var(--nb-ovl-border);
  overflow: hidden;
}

.nb-ovl .overlay-counter {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: rgba(240,239,235,0.25);
  margin-bottom: 3rem;
}

.nb-ovl .menu-item {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  text-decoration: none;
  overflow: hidden;
  padding: 0.3rem 0;
  cursor: pointer;
  position: relative;
}

.nb-ovl .menu-item-inner {
  display: flex;
  align-items: baseline;
  gap: 1.5rem;
  transform: translateY(100%);
  transition: transform 0.6s cubic-bezier(0.23,1,0.32,1);
  width: 100%;
}

.nb-ovl .overlay.open .menu-item:nth-child(2) .menu-item-inner {
  transition-delay: 0.15s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(3) .menu-item-inner {
  transition-delay: 0.20s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(4) .menu-item-inner {
  transition-delay: 0.25s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(5) .menu-item-inner {
  transition-delay: 0.30s;
  transform: translateY(0);
}

.nb-ovl .overlay.open .menu-item:nth-child(6) .menu-item-inner {
  transition-delay: 0.35s;
  transform: translateY(0);
}

.nb-ovl .overlay.closing .menu-item .menu-item-inner {
  transform: translateY(-100%);
  transition-delay: 0s !important;
  transition-duration: 0.3s;
}

.nb-ovl .item-num {
  font-family: 'Space Mono', monospace;
  font-size: 0.7rem;
  color: rgba(240,239,235,0.3);
  letter-spacing: 0.1em;
  flex-shrink: 0;
  margin-bottom: 4px;
  align-self: flex-end;
}

.nb-ovl .item-label {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(4rem, 8vw, 8rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--nb-ovl-off-white);
  line-height: 0.9;
  transition: color 0.2s;
  position: relative;
}

.nb-ovl .item-arrow {
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.2s, transform 0.2s;
  color: var(--nb-ovl-lime);
  font-size: 2rem;
  align-self: center;
  flex-shrink: 0;
}

.nb-ovl .menu-item:hover .item-label {
  color: var(--nb-ovl-lime);
}

.nb-ovl .menu-item:hover .item-num {
  color: var(--nb-ovl-lime);
}

.nb-ovl .menu-item:hover .item-arrow {
  opacity: 1;
  transform: translateX(0);
}

.nb-ovl .item-line {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 1px;
  background: var(--nb-ovl-border);
  width: 100%;
}

.nb-ovl .overlay-sidebar {
  padding: 6rem 2.5rem 3rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 2rem;
  opacity: 0;
  transform: translateX(20px);
  transition: opacity 0.4s 0.4s, transform 0.4s 0.4s;
}

.nb-ovl .overlay.open .overlay-sidebar {
  opacity: 1;
  transform: translateX(0);
}

.nb-ovl .overlay.closing .overlay-sidebar {
  opacity: 0;
  transform: translateX(20px);
  transition-delay: 0s;
}

.nb-ovl .sidebar-block {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nb-ovl .sidebar-block-spaced {
  margin-top: 1.5rem;
}

.nb-ovl .sidebar-label {
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(240,239,235,0.3);
  margin-bottom: 0.5rem;
}

.nb-ovl .sidebar-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: rgba(240,239,235,0.6);
  text-decoration: none;
  transition: color 0.15s;
  padding: 3px 0;
}

.nb-ovl .sidebar-link:hover {
  color: var(--nb-ovl-off-white);
}

.nb-ovl .sidebar-link::before {
  content: '→';
  color: var(--nb-ovl-lime);
  font-size: 0.7rem;
}

.nb-ovl .sidebar-status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: rgba(240,239,235,0.5);
}

.nb-ovl .status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nb-ovl-lime);
  box-shadow: 0 0 8px var(--nb-ovl-lime);
  flex-shrink: 0;
  animation: nb-ovl-pulse 2s ease-in-out infinite;
}

@keyframes nb-ovl-pulse {
  0%,
    100% {
    box-shadow: 0 0 8px var(--nb-ovl-lime);
  }

  50% {
    box-shadow: 0 0 16px var(--nb-ovl-lime);
  }
}

.nb-ovl .sidebar-social {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nb-ovl .social-link {
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  color: rgba(240,239,235,0.35);
  text-decoration: none;
  transition: color 0.15s;
}

.nb-ovl .social-link:hover {
  color: var(--nb-ovl-lime);
}

.nb-ovl .page {
  min-height: 720px;
  position: relative;
  overflow: hidden;
}

.nb-ovl .page::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.05'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}

.nb-ovl .bg-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(12rem, 25vw, 28rem);
  font-weight: 400;
  color: transparent;
  -webkit-text-stroke: 1px rgba(240,239,235,0.04);
  letter-spacing: 0.05em;
  white-space: nowrap;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  line-height: 1;
}

.nb-ovl .hero-content {
  position: relative;
  z-index: 1;
  min-height: 720px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 4rem 3rem;
}

.nb-ovl .hero-caption {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 3rem;
  align-items: end;
  max-width: 1200px;
}

.nb-ovl .h-eyebrow {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 1rem;
}

.nb-ovl .h-eyebrow-line {
  width: 40px;
  height: 1.5px;
  background: var(--nb-ovl-lime);
}

.nb-ovl .h-eyebrow-text {
  font-family: 'Space Mono', monospace;
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  color: rgba(240,239,235,0.45);
  text-transform: uppercase;
}

.nb-ovl .h-title {
  font-family: 'Bebas Neue', sans-serif;
  font-size: clamp(4rem, 10vw, 12rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 0.9;
  color: var(--nb-ovl-off-white);
}

.nb-ovl .h-title .accent {
  color: var(--nb-ovl-lime);
}

.nb-ovl .h-right {
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 1.5rem;
  padding-bottom: 0.5rem;
}

.nb-ovl .h-desc {
  font-size: 0.9rem;
  color: rgba(240,239,235,0.5);
  line-height: 1.65;
  max-width: 36ch;
}

.nb-ovl .h-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nb-ovl-void);
  background: var(--nb-ovl-lime);
  border: none;
  padding: 12px 24px;
  border-radius: 100px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  width: fit-content;
  font-family: inherit;
}

.nb-ovl .h-cta:hover {
  background: #d4f850;
  transform: translateX(4px);
}

.nb-ovl .corner-deco {
  position: absolute;
  top: 2rem;
  right: 2rem;
  font-family: 'Space Mono', monospace;
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: rgba(240,239,235,0.15);
  text-align: right;
  line-height: 2;
  z-index: 1;
  pointer-events: none;
}

.nb-ovl .grid-deco {
  position: absolute;
  bottom: 3rem;
  right: 3rem;
  display: grid;
  grid-template-columns: repeat(5, 6px);
  grid-template-rows: repeat(5, 6px);
  gap: 4px;
  z-index: 1;
  pointer-events: none;
}

.nb-ovl .grid-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(240,239,235,0.12);
}

.nb-ovl .grid-dot.lit {
  background: var(--nb-ovl-lime);
  opacity: 0.6;
}

@media (max-width: 768px) {
  .nb-ovl .hero-caption {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .nb-ovl .overlay-content {
    grid-template-columns: 1fr;
  }

  .nb-ovl .overlay-sidebar {
    display: none;
  }

  .nb-ovl .overlay-nav {
    padding: 6rem 2rem;
  }

  .nb-ovl .item-label {
    font-size: clamp(3rem, 12vw, 6rem);
  }

  .nb-ovl header {
    padding: 1rem 1.25rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nb-ovl .overlay-panel,
    .nb-ovl .menu-item-inner,
    .nb-ovl .overlay-sidebar,
    .nb-ovl .status-dot,
    .nb-ovl .menu-line {
    transition: none !important;
    animation: none !important;
  }
}
```

## JavaScript
```js
(() => {
  // Scoped fullscreen-overlay wiring. Drops the source mock's
  // `document.body.style.overflow = 'hidden'` since the embedded
  // wrapper isn't the viewport. Escape-to-close listener bound to
  // the wrapper, so two demos can coexist on one page.
  const root = document.querySelector('.nb-ovl');
  if (!root) return;
  const overlay = root.querySelector('[data-nb-ovl-overlay]');
  const toggle = root.querySelector('[data-nb-ovl-toggle]');
  const opener = root.querySelector('[data-nb-ovl-open]');
  const dotGrid = root.querySelector('[data-nb-ovl-dotgrid]');
  if (!overlay || !toggle) return;

  // Build the 5x5 dot grid once.
  if (dotGrid && dotGrid.childElementCount === 0) {
    for (let i = 0; i < 25; i++) {
      const d = document.createElement('div');
      d.className = 'grid-dot' + (Math.random() > 0.7 ? ' lit' : '');
      dotGrid.appendChild(d);
    }
  }

  let isOpen = false;
  function openMenu() {
    isOpen = true;
    overlay.classList.remove('closing');
    overlay.classList.add('open');
    toggle.classList.add('open');
    toggle.setAttribute('aria-expanded', 'true');
    overlay.setAttribute('aria-hidden', 'false');
  }
  function closeMenu() {
    if (!isOpen) return;
    isOpen = false;
    overlay.classList.add('closing');
    toggle.classList.remove('open');
    toggle.setAttribute('aria-expanded', 'false');
    overlay.setAttribute('aria-hidden', 'true');
    setTimeout(() => {
      overlay.classList.remove('open', 'closing');
    }, 650);
  }

  toggle.addEventListener('click', () => { isOpen ? closeMenu() : openMenu(); });
  if (opener) opener.addEventListener('click', openMenu);

  // Close on any overlay menu item click.
  root.querySelectorAll('[data-nb-ovl-link]').forEach((link) => {
    link.addEventListener('click', (e) => {
      e.preventDefault();
      closeMenu();
    });
  });

  // Escape closes (only when overlay is open). Listener on wrapper so
  // multiple demos don't all close on one keypress.
  root.addEventListener('keydown', (e) => {
    if (e.key === 'Escape' && isOpen) closeMenu();
  });

  // Subtle dot animation, scoped.
  let dotTimer = null;
  if (dotGrid) {
    dotTimer = setInterval(() => {
      const dots = dotGrid.querySelectorAll('.grid-dot');
      if (!dots.length) return;
      const idx = Math.floor(Math.random() * dots.length);
      dots[idx].classList.toggle('lit');
    }, 800);
    root._nbOvlDotTimer = dotTimer;
  }
})();
```

Techniques used in this demo

mix-blend-modeMDN ↗grid-templateMDN ↗@keyframesMDN ↗clamp()MDN ↗

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