34 CSS Floating Buttons03 / 34

Pure CSSMIT licensed

WhatsApp Floating Message Button CSS

The green "message us" button every small-business site puts in the bottom-right corner, done properly: a resting circle that expands into a labelled pill on hover and focus, an attention pulse that runs three times and then stops, and an online/away status dot. The label is real text inside the button, so it is announced, translatable and searchable — not a tooltip bolted on with a data-attribute.

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The code

<section class="fb-03" aria-label="Floating message button demo">
  <div class="fb-03__page">
    <div class="fb-03__hero">
      <p class="fb-03__eyebrow">grid-template-columns 0fr → 1fr</p>
      <h2 class="fb-03__title">A circle that becomes a sentence</h2>
      <p class="fb-03__sub">Hover or tab to the button. The label is real text inside the same element, so the accessible name never changes as it expands.</p>
      <p class="fb-03__chip">3-cycle pulse · intrinsic width · status dot</p>
    </div>
    <div class="fb-03__cards" aria-hidden="true">
      <div class="fb-03__card"></div><div class="fb-03__card"></div><div class="fb-03__card"></div>
    </div>
  </div>
  <button class="fb-03__msg" type="button">
    <span class="fb-03__ico">
      <svg viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M4 5.6A2.4 2.4 0 0 1 6.4 3.2h11.2A2.4 2.4 0 0 1 20 5.6v7.2a2.4 2.4 0 0 1-2.4 2.4h-6.24l-4.02 3.2A.6.6 0 0 1 6.4 17.9v-2.7H6.4A2.4 2.4 0 0 1 4 12.8V5.6z" fill="currentColor"/><circle cx="9" cy="9.2" r="1.05" fill="var(--fb-03-brand)"/><circle cx="12" cy="9.2" r="1.05" fill="var(--fb-03-brand)"/><circle cx="15" cy="9.2" r="1.05" fill="var(--fb-03-brand)"/></svg>
      <span class="fb-03__status" aria-hidden="true"></span>
    </span>
    <span class="fb-03__label"><b>Message us</b><i>Typically replies in 5 min</i></span>
  </button>
</section>
.fb-03 {
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: block;
  background: var(--fb-03-bg);
  --fb-03-bg: oklch(0.97 0.012 150);
  --fb-03-brand: oklch(0.62 0.16 152);
  --fb-03-brandDeep: oklch(0.5 0.14 152);
  --fb-03-ink: oklch(0.24 0.03 160);
  --fb-03-mut: oklch(0.54 0.02 160);
  font-family: 'Segoe UI',system-ui,-apple-system,sans-serif;
  color: var(--fb-03-ink);
  position: relative;
  display: grid;
  place-items: center;
  padding: clamp(20px,5vw,56px);
  overflow: hidden;
}

.fb-03 *,
.fb-03 *::before,
.fb-03 *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.fb-03__page {
  width: min(100%,660px);
  display: grid;
  gap: clamp(20px,4vw,34px);
  justify-items: center;
  text-align: center;
}

.fb-03__hero {
  display: grid;
  gap: 11px;
  justify-items: center;
}

.fb-03__eyebrow {
  font-family: ui-monospace,Menlo,Consolas,monospace;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fb-03-brandDeep);
}

.fb-03__title {
  font-size: clamp(26px,4.6vw,44px);
  line-height: 1.05;
  letter-spacing: -.03em;
  font-weight: 700;
  text-wrap: balance;
}

.fb-03__sub {
  max-width: 50ch;
  font-size: clamp(13.5px,1.7vw,16.5px);
  line-height: 1.62;
  color: var(--fb-03-mut);
  text-wrap: pretty;
}

.fb-03__chip {
  font-family: ui-monospace,Menlo,Consolas,monospace;
  font-size: 11px;
  color: var(--fb-03-mut);
  padding: 8px 14px;
  border: 1px solid oklch(0.24 0.03 160/.14);
  border-radius: 99px;
}

.fb-03__cards {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 14px;
  width: 100%;
}

.fb-03__card {
  height: clamp(72px,12vw,104px);
  border-radius: 16px;
  background: oklch(1 0 0);
  border: 1px solid oklch(0.24 0.03 160/.09);
  box-shadow: 0 10px 26px -20px oklch(0.24 0.03 160/.6);
}

.fb-03__card:nth-child(2) {
  background: linear-gradient(120deg,oklch(0.93 0.04 152),oklch(0.98 0.01 152));
}

.fb-03__msg {
  position: absolute;
  right: clamp(16px,3vw,30px);
  bottom: calc(clamp(16px,3vw,30px) + env(safe-area-inset-bottom));
  z-index: 5;
  display: grid;
  grid-template-columns: auto 0fr;
  align-items: center;
  gap: 0;
  min-height: 60px;
  padding: 8px;
  border: 0;
  border-radius: 99px;
  background: linear-gradient(180deg,var(--fb-03-brand),var(--fb-03-brandDeep));
  color: oklch(0.99 0.01 152);
  cursor: pointer;
  text-align: left;
  box-shadow: 0 8px 26px -8px oklch(0.5 0.14 152/.7),0 2px 6px oklch(0.3 0.06 152/.25);
  transition: grid-template-columns .34s cubic-bezier(.2,.8,.2,1),gap .34s cubic-bezier(.2,.8,.2,1),box-shadow .3s ease,transform .2s ease;
}

.fb-03__msg:is(:hover,:focus-visible) {
  grid-template-columns: auto 1fr;
  gap: 12px;
  box-shadow: 0 14px 34px -8px oklch(0.5 0.14 152/.75);
}

.fb-03__msg:focus-visible {
  outline: 3px solid var(--fb-03-brandDeep);
  outline-offset: 3px;
}

.fb-03__msg:active {
  transform: scale(.97);
}

.fb-03__ico {
  position: relative;
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: oklch(1 0 0/.16);
}

.fb-03__ico svg {
  width: 26px;
  height: 26px;
}

.fb-03__ico::after {
  content: "";
  position: absolute;
  inset: -9px;
  border-radius: 50%;
  border: 2px solid oklch(1 0 0/.55);
  animation: fb-03-pulse 2.1s ease-out 3;
  pointer-events: none;
}

.fb-03__msg:hover .fb-03__ico::after {
  animation: fb-03-pulse 2.1s ease-out 3;
}

@keyframes fb-03-pulse {
  0% {
    transform: scale(.86);
    opacity: .8;
  }

  70% {
    transform: scale(1.35);
    opacity: 0;
  }

  100% {
    transform: scale(1.35);
    opacity: 0;
  }
}

.fb-03__status {
  position: absolute;
  right: 1px;
  bottom: 1px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: oklch(0.85 0.19 130);
  box-shadow: 0 0 0 2.5px var(--fb-03-brandDeep);
}

.fb-03__label {
  overflow: hidden;
  white-space: nowrap;
  display: grid;
  gap: 1px;
  min-width: 0;
}

.fb-03__msg:is(:hover,:focus-visible) .fb-03__label {
  padding-right: 6px;
}

.fb-03__label b {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -.01em;
}

.fb-03__label i {
  font-style: normal;
  font-size: 11.5px;
  color: oklch(0.97 0.02 152/.82);
}

@media (prefers-reduced-motion: reduce) {
  .fb-03__msg {
    transition: none;
  }

  .fb-03__ico::after {
    animation: none;
    opacity: 0;
  }
}
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 Floating Button 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: WhatsApp Floating Message Button CSS
Source: https://codefronts.com/components/css-floating-buttons/whatsapp-floating-message-button-css/

The green "message us" button every small-business site puts in the bottom-right corner, done properly: a resting circle that expands into a labelled pill on hover and focus, an attention pulse that runs three times and then stops, and an online/away status dot. The label is real text inside the button, so it is announced, translatable and searchable — not a tooltip bolted on with a data-attribute.
## HTML
```html
<section class="fb-03" aria-label="Floating message button demo">
  <div class="fb-03__page">
    <div class="fb-03__hero">
      <p class="fb-03__eyebrow">grid-template-columns 0fr → 1fr</p>
      <h2 class="fb-03__title">A circle that becomes a sentence</h2>
      <p class="fb-03__sub">Hover or tab to the button. The label is real text inside the same element, so the accessible name never changes as it expands.</p>
      <p class="fb-03__chip">3-cycle pulse · intrinsic width · status dot</p>
    </div>
    <div class="fb-03__cards" aria-hidden="true">
      <div class="fb-03__card"></div><div class="fb-03__card"></div><div class="fb-03__card"></div>
    </div>
  </div>
  <button class="fb-03__msg" type="button">
    <span class="fb-03__ico">
      <svg viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M4 5.6A2.4 2.4 0 0 1 6.4 3.2h11.2A2.4 2.4 0 0 1 20 5.6v7.2a2.4 2.4 0 0 1-2.4 2.4h-6.24l-4.02 3.2A.6.6 0 0 1 6.4 17.9v-2.7H6.4A2.4 2.4 0 0 1 4 12.8V5.6z" fill="currentColor"/><circle cx="9" cy="9.2" r="1.05" fill="var(--fb-03-brand)"/><circle cx="12" cy="9.2" r="1.05" fill="var(--fb-03-brand)"/><circle cx="15" cy="9.2" r="1.05" fill="var(--fb-03-brand)"/></svg>
      <span class="fb-03__status" aria-hidden="true"></span>
    </span>
    <span class="fb-03__label"><b>Message us</b><i>Typically replies in 5 min</i></span>
  </button>
</section>
```
## CSS
```css
.fb-03 {
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: block;
  background: var(--fb-03-bg);
  --fb-03-bg: oklch(0.97 0.012 150);
  --fb-03-brand: oklch(0.62 0.16 152);
  --fb-03-brandDeep: oklch(0.5 0.14 152);
  --fb-03-ink: oklch(0.24 0.03 160);
  --fb-03-mut: oklch(0.54 0.02 160);
  font-family: 'Segoe UI',system-ui,-apple-system,sans-serif;
  color: var(--fb-03-ink);
  position: relative;
  display: grid;
  place-items: center;
  padding: clamp(20px,5vw,56px);
  overflow: hidden;
}

.fb-03 *,
.fb-03 *::before,
.fb-03 *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

.fb-03__page {
  width: min(100%,660px);
  display: grid;
  gap: clamp(20px,4vw,34px);
  justify-items: center;
  text-align: center;
}

.fb-03__hero {
  display: grid;
  gap: 11px;
  justify-items: center;
}

.fb-03__eyebrow {
  font-family: ui-monospace,Menlo,Consolas,monospace;
  font-size: 11.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--fb-03-brandDeep);
}

.fb-03__title {
  font-size: clamp(26px,4.6vw,44px);
  line-height: 1.05;
  letter-spacing: -.03em;
  font-weight: 700;
  text-wrap: balance;
}

.fb-03__sub {
  max-width: 50ch;
  font-size: clamp(13.5px,1.7vw,16.5px);
  line-height: 1.62;
  color: var(--fb-03-mut);
  text-wrap: pretty;
}

.fb-03__chip {
  font-family: ui-monospace,Menlo,Consolas,monospace;
  font-size: 11px;
  color: var(--fb-03-mut);
  padding: 8px 14px;
  border: 1px solid oklch(0.24 0.03 160/.14);
  border-radius: 99px;
}

.fb-03__cards {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 14px;
  width: 100%;
}

.fb-03__card {
  height: clamp(72px,12vw,104px);
  border-radius: 16px;
  background: oklch(1 0 0);
  border: 1px solid oklch(0.24 0.03 160/.09);
  box-shadow: 0 10px 26px -20px oklch(0.24 0.03 160/.6);
}

.fb-03__card:nth-child(2) {
  background: linear-gradient(120deg,oklch(0.93 0.04 152),oklch(0.98 0.01 152));
}

.fb-03__msg {
  position: absolute;
  right: clamp(16px,3vw,30px);
  bottom: calc(clamp(16px,3vw,30px) + env(safe-area-inset-bottom));
  z-index: 5;
  display: grid;
  grid-template-columns: auto 0fr;
  align-items: center;
  gap: 0;
  min-height: 60px;
  padding: 8px;
  border: 0;
  border-radius: 99px;
  background: linear-gradient(180deg,var(--fb-03-brand),var(--fb-03-brandDeep));
  color: oklch(0.99 0.01 152);
  cursor: pointer;
  text-align: left;
  box-shadow: 0 8px 26px -8px oklch(0.5 0.14 152/.7),0 2px 6px oklch(0.3 0.06 152/.25);
  transition: grid-template-columns .34s cubic-bezier(.2,.8,.2,1),gap .34s cubic-bezier(.2,.8,.2,1),box-shadow .3s ease,transform .2s ease;
}

.fb-03__msg:is(:hover,:focus-visible) {
  grid-template-columns: auto 1fr;
  gap: 12px;
  box-shadow: 0 14px 34px -8px oklch(0.5 0.14 152/.75);
}

.fb-03__msg:focus-visible {
  outline: 3px solid var(--fb-03-brandDeep);
  outline-offset: 3px;
}

.fb-03__msg:active {
  transform: scale(.97);
}

.fb-03__ico {
  position: relative;
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: oklch(1 0 0/.16);
}

.fb-03__ico svg {
  width: 26px;
  height: 26px;
}

.fb-03__ico::after {
  content: "";
  position: absolute;
  inset: -9px;
  border-radius: 50%;
  border: 2px solid oklch(1 0 0/.55);
  animation: fb-03-pulse 2.1s ease-out 3;
  pointer-events: none;
}

.fb-03__msg:hover .fb-03__ico::after {
  animation: fb-03-pulse 2.1s ease-out 3;
}

@keyframes fb-03-pulse {
  0% {
    transform: scale(.86);
    opacity: .8;
  }

  70% {
    transform: scale(1.35);
    opacity: 0;
  }

  100% {
    transform: scale(1.35);
    opacity: 0;
  }
}

.fb-03__status {
  position: absolute;
  right: 1px;
  bottom: 1px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: oklch(0.85 0.19 130);
  box-shadow: 0 0 0 2.5px var(--fb-03-brandDeep);
}

.fb-03__label {
  overflow: hidden;
  white-space: nowrap;
  display: grid;
  gap: 1px;
  min-width: 0;
}

.fb-03__msg:is(:hover,:focus-visible) .fb-03__label {
  padding-right: 6px;
}

.fb-03__label b {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -.01em;
}

.fb-03__label i {
  font-style: normal;
  font-size: 11.5px;
  color: oklch(0.97 0.02 152/.82);
}

@media (prefers-reduced-motion: reduce) {
  .fb-03__msg {
    transition: none;
  }

  .fb-03__ico::after {
    animation: none;
    opacity: 0;
  }
}
```

How this works

The expand is a grid trick, not a width animation. The label lives in a track that animates from 0fr to 1fr:

.msg{ display:grid; grid-template-columns:auto 0fr; gap:0;
      transition:grid-template-columns .34s cubic-bezier(.2,.8,.2,1), gap .34s }
.msg:is(:hover,:focus-visible){ grid-template-columns:auto 1fr; gap:12px }
.msg__label{ overflow:hidden; white-space:nowrap }

Animating grid-template-columns beats animating width or max-width because the end state is the label's intrinsic width — no magic number, so it works in every language without re-tuning. It beats transform:scaleX because the text is never distorted.

The pulse is a pseudo-element ring with animation-iteration-count:3. Infinite pulses on a persistent widget are an accessibility and attention problem; three cycles announce the button, then get out of the way. It restarts on hover, which is where the user's attention already is.

Because the pill is the same element in both states, focus never moves, the accessible name never changes, and there is no second hidden element to keep in sync.

Make it yours

  • Left-side placement: switch right to left and set direction:rtl on the button (with direction:ltr on the label) so the pill grows away from the edge.
  • Channel colour: --fb-03-brand drives circle, ring, and shadow. Blue for Messenger-style, indigo for a generic support channel.
  • Always-open pill: delete the collapsed grid state and ship grid-template-columns:auto 1fr — higher click-through, more visual weight.
  • Stacked channels: repeat the button in a column with gap:12px and give each a different brand token for a multi-channel contact stack.

Gotchas — read before shipping

  • Never animate width to a hard-coded px value for a text pill — translations overflow or get clipped. The 0fr → 1fr grid track measures the text for you.
  • A permanently pulsing widget competes with your content and can trigger motion sensitivity. Cap iterations and always honour prefers-reduced-motion.
  • Fixed-position widgets sit on top of mobile bottom navigation and cookie bars. Reserve space with bottom:calc(20px + env(safe-area-inset-bottom)) and check your consent banner's z-index.
  • If the label is hidden with display:none instead of an overflow-clipped track, the accessible name disappears in the collapsed state. Clip it, don't remove it.

Browser support

ChromeSafariFirefoxEdge
114+17.5+121+114+

Floor set by oklch(), text-wrap as this demo is written. The core technique itself goes back further — Chrome 111+.

Animatable grid-template-columns needs Chrome 107+, Firefox 127+ and Safari 16+. In older engines the pill snaps open instantly instead of sliding — same functionality, no animation.

Techniques used in this demo

text-wrap: prettyMDN ↗grid-templateMDN ↗@keyframesMDN ↗clamp()MDN ↗place-items / place-contentMDN ↗oklch()MDN ↗

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