Glass FAB

Frosted-glass FAB with backdrop blur — sits beautifully over hero images, gradients, and patterned backgrounds. Border softens on hover.

Pure CSS MIT licensed

Glass FAB the 8th of 16 designs in the 16 CSS Floating Action Button Designs collection. The design is implemented in pure CSS — no JavaScript required. Copy the HTML and CSS panels below into your project. Because the demo is pure CSS, it works in any framework or templating engine you happen to use. The design honours prefers-reduced-motion and uses real semantic markup, so it ships accessibility-ready out of the box.

Live preview

Open in playground

The code

<div class="cfb-glass-bg">
  <button type="button" class="cfb-glass" aria-label="Quick action">
    <svg viewBox="0 0 24 24" aria-hidden="true">
      <polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2" />
    </svg>
  </button>
</div>

.cfb-glass-bg {
  display: inline-flex;
  padding: 24px;
  border-radius: 16px;
  background: linear-gradient(135deg, #2a1a4a 0%, #4a2a6a 50%, #ff6c8a 100%);
}
.cfb-glass {
  width: 52px; height: 52px;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 50%;
  background: rgba(255,255,255,0.12);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  color: #fff;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 24px rgba(0,0,0,0.25);
  transition: background 0.25s, border-color 0.25s, transform 0.25s;
}
.cfb-glass:hover {
  background: rgba(255,255,255,0.22);
  border-color: rgba(255,255,255,0.45);
  transform: translateY(-2px);
}
.cfb-glass:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
.cfb-glass svg { width: 20px; height: 20px; fill: currentColor; }

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