28 CSS Hamburger Menus11 / 28

CSS + JSMIT licensed

Full Screen Mobile Navigation Overlay CSS

The fashion-house takeover: the menu doesn't open a panel, it becomes the page — a near-black sheet where five oversized links reveal themselves line-by-line from under invisible masks, each with an index number and a hover state that slides in an em-dash and fills the outlined type. The mask reveal is the technique to steal: an overflow:hidden li with the link translating up from 110% below, staggered, so text appears to be printed onto the page.

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The code

<section class="chm-11" aria-label="Fullscreen overlay navigation demo">
  <div class="chm-11__stage">
    <div class="chm-11__page" aria-hidden="true">
      <div class="chm-11__hero"><span>AW·26</span><b>Silhouettes<br>in Static</b></div>
      <div class="chm-11__ln" style="--w:76%"></div>
      <div class="chm-11__ln" style="--w:58%"></div>
    </div>
    <nav class="chm-11__sheet" id="chm11-sheet" aria-label="Site">
      <ul>
        <li style="--i:0"><a href="#collections" data-n="01">Collections</a></li>
        <li style="--i:1"><a href="#runway" data-n="02">Runway</a></li>
        <li style="--i:2"><a href="#atelier" data-n="03">Atelier</a></li>
        <li style="--i:3"><a href="#stockists" data-n="04">Stockists</a></li>
        <li style="--i:4"><a href="#contact" data-n="05">Contact</a></li>
      </ul>
      <footer class="chm-11__foot">
        <a href="#instagram">Instagram</a><a href="#pinterest">Pinterest</a><span>Paris — Tokyo</span>
      </footer>
    </nav>
    <header class="chm-11__bar">
      <span class="chm-11__brand">VESTIGE</span>
      <button class="chm-11__btn" type="button" aria-expanded="false" aria-controls="chm11-sheet">
        <span class="chm-11__btnw"><i>Menu</i><i>Close</i></span>
        <span class="chm-11__ico" aria-hidden="true"><b></b><b></b></span>
      </button>
    </header>
  </div>
</section>
.chm-11,
.chm-11 *,
.chm-11 *::before,
.chm-11 *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.chm-11 {
  background: var(--bg);
  width: 100%;
  min-height: 100vh;
  box-sizing: border-box;
  --paper: oklch(0.95 0.007 80);
  --sheet: oklch(0.16 0.012 70);
  --mut: oklch(0.6 0.015 70);
  --acc: oklch(0.78 0.15 75);
  font-family: 'Segoe UI',system-ui,sans-serif;
  color: var(--sheet);
  display: grid;
  justify-content: center;
  container-type: inline-size;
}

.chm-11__stage {
  position: relative;
  width: min(400px,88cqi,88vw);
  height: 560px;
  border-radius: 24px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid oklch(0.86 0.01 80);
}

.chm-11__bar {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 22px;
  mix-blend-mode: difference;
  color: oklch(0.95 0.007 80);
}

.chm-11__brand {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .34em;
}

.chm-11__btn {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: 600 12px 'Segoe UI',system-ui,sans-serif;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.chm-11__btn:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 4px;
  border-radius: 4px;
}

.chm-11__btnw {
  position: relative;
  height: 15px;
  overflow: hidden;
  display: block;
}

.chm-11__btnw i {
  display: block;
  height: 15px;
  line-height: 15px;
  font-style: normal;
  transition: translate .4s cubic-bezier(.65,0,.35,1);
}

[data-open] .chm-11__btnw i {
  translate: 0 -15px;
}

.chm-11__ico {
  position: relative;
  width: 26px;
  height: 10px;
  display: block;
}

.chm-11__ico b {
  position: absolute;
  left: 0;
  width: 26px;
  height: 1.5px;
  background: currentColor;
  transition: translate .35s cubic-bezier(.65,0,.35,1),rotate .35s cubic-bezier(.65,0,.35,1) .04s;
}

.chm-11__ico b:nth-child(1) {
  top: 0;
}

.chm-11__ico b:nth-child(2) {
  top: 8px;
}

[data-open] .chm-11__ico b:nth-child(1) {
  translate: 0 4px;
  rotate: 20deg;
}

[data-open] .chm-11__ico b:nth-child(2) {
  translate: 0 -4px;
  rotate: -20deg;
}

.chm-11__page {
  position: absolute;
  inset: 0;
  padding: 92px 26px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.chm-11__hero {
  height: 250px;
  border-radius: 4px;
  background: linear-gradient(160deg,oklch(0.85 0.02 75),oklch(0.72 0.045 60));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px;
}

.chm-11__hero span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .3em;
}

.chm-11__hero b {
  font-size: 29px;
  line-height: 1.04;
  letter-spacing: -.02em;
  font-weight: 700;
}

.chm-11__ln {
  height: 10px;
  width: var(--w);
  border-radius: 99px;
  background: oklch(0.87 0.012 80);
}

.chm-11__sheet {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: var(--sheet);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 30px;
  opacity: 0;
  scale: 1.03;
  visibility: hidden;
  transition: opacity .35s,scale .45s cubic-bezier(.2,.7,.2,1),visibility 0s .45s;
}

[data-open] .chm-11__sheet {
  opacity: 1;
  scale: 1;
  visibility: visible;
  transition-delay: 0s;
}

.chm-11__sheet ul {
  list-style: none;
}

.chm-11__sheet li {
  overflow: hidden;
}

.chm-11__sheet li a {
  display: block;
  padding: 7px 0;
  font-size: clamp(34px,9cqi,44px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.08;
  text-transform: uppercase;
  text-decoration: none;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--paper);
  translate: 0 110%;
  transition: translate .6s cubic-bezier(.2,.75,.15,1),color .25s;
}

.chm-11__sheet li a::before {
  content: attr(data-n) " ";
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  -webkit-text-stroke: 0;
  color: var(--acc);
  vertical-align: super;
  margin-right: 8px;
}

[data-open] .chm-11__sheet li a {
  translate: 0 0;
  transition-delay: calc(.25s + var(--i)*.07s),0s;
}

.chm-11__sheet li a:hover,
.chm-11__sheet li a:focus-visible {
  color: var(--paper);
}

.chm-11__sheet li a:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 4px;
}

.chm-11__foot {
  display: flex;
  gap: 18px;
  align-items: baseline;
  margin-top: 34px;
  font-size: 12px;
  color: var(--mut);
  opacity: 0;
  transition: opacity .4s .5s;
}

[data-open] .chm-11__foot {
  opacity: 1;
}

.chm-11__foot a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid oklch(1 0 0/.25);
  padding-bottom: 2px;
}

.chm-11__foot a:hover,
.chm-11__foot a:focus-visible {
  border-color: var(--acc);
  color: var(--acc);
}

.chm-11__foot span {
  margin-left: auto;
}

@media (prefers-reduced-motion: reduce) {
  .chm-11 * {
    transition-duration: .01s !important;
    transition-delay: 0s !important;
  }
}
(function () {
  document.querySelectorAll('.chm-11__stage').forEach(function (stage) {
    if (stage.dataset.bound) return; stage.dataset.bound = '1';
    var btn = stage.querySelector('.chm-11__btn');
    function set(open) {
      stage.toggleAttribute('data-open', open);
      btn.setAttribute('aria-expanded', String(open));
    }
    btn.addEventListener('click', function () { set(btn.getAttribute('aria-expanded') !== 'true'); });
    stage.addEventListener('keydown', function (e) {
      if (e.key === 'Escape' && stage.hasAttribute('data-open')) { set(false); btn.focus(); }
    });
  });
})();
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 Hamburger Menu 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 Mobile Navigation Overlay CSS
Source: https://codefronts.com/navigation/css-hamburger-menus/full-screen-overlay-mobile-navigation/

The fashion-house takeover: the menu doesn't open a panel, it becomes the page — a near-black sheet where five oversized links reveal themselves line-by-line from under invisible masks, each with an index number and a hover state that slides in an em-dash and fills the outlined type. The mask reveal is the technique to steal: an overflow:hidden li with the link translating up from 110% below, staggered, so text appears to be printed onto the page.
## HTML
```html
<section class="chm-11" aria-label="Fullscreen overlay navigation demo">
  <div class="chm-11__stage">
    <div class="chm-11__page" aria-hidden="true">
      <div class="chm-11__hero"><span>AW·26</span><b>Silhouettes<br>in Static</b></div>
      <div class="chm-11__ln" style="--w:76%"></div>
      <div class="chm-11__ln" style="--w:58%"></div>
    </div>
    <nav class="chm-11__sheet" id="chm11-sheet" aria-label="Site">
      <ul>
        <li style="--i:0"><a href="#collections" data-n="01">Collections</a></li>
        <li style="--i:1"><a href="#runway" data-n="02">Runway</a></li>
        <li style="--i:2"><a href="#atelier" data-n="03">Atelier</a></li>
        <li style="--i:3"><a href="#stockists" data-n="04">Stockists</a></li>
        <li style="--i:4"><a href="#contact" data-n="05">Contact</a></li>
      </ul>
      <footer class="chm-11__foot">
        <a href="#instagram">Instagram</a><a href="#pinterest">Pinterest</a><span>Paris — Tokyo</span>
      </footer>
    </nav>
    <header class="chm-11__bar">
      <span class="chm-11__brand">VESTIGE</span>
      <button class="chm-11__btn" type="button" aria-expanded="false" aria-controls="chm11-sheet">
        <span class="chm-11__btnw"><i>Menu</i><i>Close</i></span>
        <span class="chm-11__ico" aria-hidden="true"><b></b><b></b></span>
      </button>
    </header>
  </div>
</section>
```
## CSS
```css
.chm-11,
.chm-11 *,
.chm-11 *::before,
.chm-11 *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.chm-11 {
  background: var(--bg);
  width: 100%;
  min-height: 100vh;
  box-sizing: border-box;
  --paper: oklch(0.95 0.007 80);
  --sheet: oklch(0.16 0.012 70);
  --mut: oklch(0.6 0.015 70);
  --acc: oklch(0.78 0.15 75);
  font-family: 'Segoe UI',system-ui,sans-serif;
  color: var(--sheet);
  display: grid;
  justify-content: center;
  container-type: inline-size;
}

.chm-11__stage {
  position: relative;
  width: min(400px,88cqi,88vw);
  height: 560px;
  border-radius: 24px;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid oklch(0.86 0.01 80);
}

.chm-11__bar {
  position: absolute;
  inset: 0 0 auto 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 22px;
  mix-blend-mode: difference;
  color: oklch(0.95 0.007 80);
}

.chm-11__brand {
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .34em;
}

.chm-11__btn {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  border: none;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: 600 12px 'Segoe UI',system-ui,sans-serif;
  letter-spacing: .18em;
  text-transform: uppercase;
}

.chm-11__btn:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 4px;
  border-radius: 4px;
}

.chm-11__btnw {
  position: relative;
  height: 15px;
  overflow: hidden;
  display: block;
}

.chm-11__btnw i {
  display: block;
  height: 15px;
  line-height: 15px;
  font-style: normal;
  transition: translate .4s cubic-bezier(.65,0,.35,1);
}

[data-open] .chm-11__btnw i {
  translate: 0 -15px;
}

.chm-11__ico {
  position: relative;
  width: 26px;
  height: 10px;
  display: block;
}

.chm-11__ico b {
  position: absolute;
  left: 0;
  width: 26px;
  height: 1.5px;
  background: currentColor;
  transition: translate .35s cubic-bezier(.65,0,.35,1),rotate .35s cubic-bezier(.65,0,.35,1) .04s;
}

.chm-11__ico b:nth-child(1) {
  top: 0;
}

.chm-11__ico b:nth-child(2) {
  top: 8px;
}

[data-open] .chm-11__ico b:nth-child(1) {
  translate: 0 4px;
  rotate: 20deg;
}

[data-open] .chm-11__ico b:nth-child(2) {
  translate: 0 -4px;
  rotate: -20deg;
}

.chm-11__page {
  position: absolute;
  inset: 0;
  padding: 92px 26px;
  display: grid;
  gap: 16px;
  align-content: start;
}

.chm-11__hero {
  height: 250px;
  border-radius: 4px;
  background: linear-gradient(160deg,oklch(0.85 0.02 75),oklch(0.72 0.045 60));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px;
}

.chm-11__hero span {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .3em;
}

.chm-11__hero b {
  font-size: 29px;
  line-height: 1.04;
  letter-spacing: -.02em;
  font-weight: 700;
}

.chm-11__ln {
  height: 10px;
  width: var(--w);
  border-radius: 99px;
  background: oklch(0.87 0.012 80);
}

.chm-11__sheet {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: var(--sheet);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 30px;
  opacity: 0;
  scale: 1.03;
  visibility: hidden;
  transition: opacity .35s,scale .45s cubic-bezier(.2,.7,.2,1),visibility 0s .45s;
}

[data-open] .chm-11__sheet {
  opacity: 1;
  scale: 1;
  visibility: visible;
  transition-delay: 0s;
}

.chm-11__sheet ul {
  list-style: none;
}

.chm-11__sheet li {
  overflow: hidden;
}

.chm-11__sheet li a {
  display: block;
  padding: 7px 0;
  font-size: clamp(34px,9cqi,44px);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.08;
  text-transform: uppercase;
  text-decoration: none;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--paper);
  translate: 0 110%;
  transition: translate .6s cubic-bezier(.2,.75,.15,1),color .25s;
}

.chm-11__sheet li a::before {
  content: attr(data-n) " ";
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  -webkit-text-stroke: 0;
  color: var(--acc);
  vertical-align: super;
  margin-right: 8px;
}

[data-open] .chm-11__sheet li a {
  translate: 0 0;
  transition-delay: calc(.25s + var(--i)*.07s),0s;
}

.chm-11__sheet li a:hover,
.chm-11__sheet li a:focus-visible {
  color: var(--paper);
}

.chm-11__sheet li a:focus-visible {
  outline: 2px solid var(--acc);
  outline-offset: 4px;
}

.chm-11__foot {
  display: flex;
  gap: 18px;
  align-items: baseline;
  margin-top: 34px;
  font-size: 12px;
  color: var(--mut);
  opacity: 0;
  transition: opacity .4s .5s;
}

[data-open] .chm-11__foot {
  opacity: 1;
}

.chm-11__foot a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid oklch(1 0 0/.25);
  padding-bottom: 2px;
}

.chm-11__foot a:hover,
.chm-11__foot a:focus-visible {
  border-color: var(--acc);
  color: var(--acc);
}

.chm-11__foot span {
  margin-left: auto;
}

@media (prefers-reduced-motion: reduce) {
  .chm-11 * {
    transition-duration: .01s !important;
    transition-delay: 0s !important;
  }
}
```

## JavaScript
```js
(function () {
  document.querySelectorAll('.chm-11__stage').forEach(function (stage) {
    if (stage.dataset.bound) return; stage.dataset.bound = '1';
    var btn = stage.querySelector('.chm-11__btn');
    function set(open) {
      stage.toggleAttribute('data-open', open);
      btn.setAttribute('aria-expanded', String(open));
    }
    btn.addEventListener('click', function () { set(btn.getAttribute('aria-expanded') !== 'true'); });
    stage.addEventListener('keydown', function (e) {
      if (e.key === 'Escape' && stage.hasAttribute('data-open')) { set(false); btn.focus(); }
    });
  });
})();
```

How this works

Every award-site menu reveal is this one trick — a clipping box and a child that starts fully outside it:

li          { overflow:hidden; }              /* the mask     */
li > a      { display:block; translate:0 110%;/* parked below */
              transition: translate .6s cubic-bezier(.2,.75,.15,1); }
[data-open] li > a{ translate:0 0;
              transition-delay: calc(.25s + var(--i) * .07s); }

Because the parent clips, the link is invisible until it climbs into the box — no opacity involved, which is why the edge looks razor-sharp, like typesetting rather than fading. The 110% (not 100%) hides descenders. The overlay itself just fades/scales in fast (.35s) while links take .6s — the sheet arrives, then the type; sequencing beats simultaneity.

The hollow-to-filled hover uses text stroke, with a custom property so both states share the ink color:

a{ color:transparent; -webkit-text-stroke:1.5px var(--paper); }
a:hover, a:focus-visible{ color:var(--paper); }

Outlined type at this scale (clamp(34px,9cqi,44px)) is legible; at body sizes it wouldn't be — scale is what licenses the effect. On close, all delays drop to 0 so the sheet and links exit together; asymmetric choreography (staggered in, instant out) is the professional default because closing is a dismissal, not a performance.

Make it yours

  • Type scale rides one clamp() — clamp(34px, 9cqi, 44px). The cqi term means the type resizes with the component, not the viewport.
  • Stagger direction: links currently reveal top-to-bottom; feed --i in reverse for bottom-up, or randomize for the 'ransom note' entrance.
  • The index numbers are ::before with counter()-free inline values so screen readers skip them (aria-hidden) — restyle or delete without touching link names.
  • Sheet color: --sheet swaps the whole mood; try oklch(0.93 0.02 90) paper + ink text for the gallery version.

Gotchas — read before shipping

  • The mask must be on the li, not the ul — one shared mask makes all links appear at once and kills the per-line typesetting illusion.
  • -webkit-text-stroke is unprefixed nowhere: write the prefixed property (all engines honor it, including Firefox). Strokes thinner than 1px shimmer on non-retina screens.
  • translate:0 110% on a display:inline element does nothing — links must be display:block inside their mask.
  • Full-viewport overlays need height:100dvh in production, never 100vh — 100vh overshoots under mobile browser chrome and your last link hides behind the URL bar.

Browser support

ChromeSafariFirefoxEdge
111+16.4+113+111+

overflow masks, translate transitions and text-stroke run everywhere back to 2020; cqi units in the type clamp need Chrome 105 / Safari 16 / Firefox 110 (falls back gracefully via the clamp bounds).

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