Frosted glass
A translucent pane over slowly moving color.
Glass Header on Scroll
A sticky site header that starts clear and frosts over once the page scrolls under it, blurring the hero as it passes. The demo loops the scroll; on a real site, a scroll timeline drives the fade.
Also known as: glassmorphism header css, sticky glass header css, frosted navbar on scroll.
HTML
<div class="gls-glass-header-on-scroll">
<div class="gls-glass-header-on-scroll-page" aria-hidden="true">
<p class="gls-glass-header-on-scroll-kicker">New in 4.0</p>
<p class="gls-glass-header-on-scroll-hero">Design that<br>stays clear.</p>
<p class="gls-glass-header-on-scroll-lede">Glass that frosts only when the page moves under it.</p>
<div class="gls-glass-header-on-scroll-grid">
<span></span><span></span><span></span>
<span></span><span></span><span></span>
<span></span><span></span><span></span>
</div>
</div>
<header class="gls-glass-header-on-scroll-bar">
<a class="gls-glass-header-on-scroll-logo" href="#"><i></i>Lumen</a>
<nav class="gls-glass-header-on-scroll-nav" aria-label="Main">
<a href="#">Work</a>
<a href="#">Pricing</a>
<a href="#">Docs</a>
</nav>
<a class="gls-glass-header-on-scroll-cta" href="#">Sign in</a>
</header>
</div>CSS
.gls-glass-header-on-scroll {
--c: var(--gls-color, #3b82f6);
font-size: var(--gls-size, 16px);
position: relative;
display: block;
width: 22em;
height: 12em;
border-radius: 1.25em;
overflow: hidden;
isolation: isolate;
background: linear-gradient(180deg, color-mix(in srgb, var(--c) 28%, #0b1020), #0b1020);
color: #fff;
font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
line-height: 1.3;
}
.gls-glass-header-on-scroll-page {
position: absolute;
left: 0;
right: 0;
top: 0;
padding: 3.6em 1.3em 1em;
animation: gls-glass-header-on-scroll-scroll 9s cubic-bezier(0.65, 0, 0.35, 1) infinite;
}
.gls-glass-header-on-scroll-page::before {
content: "";
position: absolute;
z-index: -1;
right: -2em;
top: 1.2em;
width: 12em;
height: 9em;
border-radius: 50%;
background: radial-gradient(closest-side, var(--c), transparent);
opacity: 0.85;
}
.gls-glass-header-on-scroll-kicker {
display: inline-block;
margin: 0 0 0.9em;
padding: 0.35em 0.8em;
border: 1px solid color-mix(in srgb, var(--c) 60%, transparent);
border-radius: 99em;
background: color-mix(in srgb, var(--c) 25%, transparent);
font-size: 0.55em;
font-weight: 700;
letter-spacing: 0.08em;
text-transform: uppercase;
}
.gls-glass-header-on-scroll-hero {
margin: 0;
font-size: 1.95em;
font-weight: 800;
line-height: 1.02;
letter-spacing: -0.035em;
background: linear-gradient(100deg, #fff 45%, color-mix(in srgb, var(--c) 40%, #fff));
-webkit-background-clip: text;
background-clip: text;
color: transparent;
}
.gls-glass-header-on-scroll-lede {
margin: 0.6em 0 1.1em;
font-size: 0.66em;
opacity: 0.7;
}
.gls-glass-header-on-scroll-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 0.5em;
}
.gls-glass-header-on-scroll-grid span {
height: 3em;
border-radius: 0.7em;
box-shadow: inset 0 1px 0 rgb(255 255 255 / 0.3);
}
.gls-glass-header-on-scroll-grid span:nth-child(4n + 1) { background: linear-gradient(135deg, color-mix(in srgb, var(--c) 40%, #fff), var(--c)); }
.gls-glass-header-on-scroll-grid span:nth-child(4n + 2) { background: linear-gradient(135deg, #fde68a, #f472b6); }
.gls-glass-header-on-scroll-grid span:nth-child(4n + 3) { background: linear-gradient(135deg, #5eead4, #6366f1); }
.gls-glass-header-on-scroll-grid span:nth-child(4n) { background: linear-gradient(135deg, #fdba74, #a855f7); }
.gls-glass-header-on-scroll-bar {
position: absolute;
left: 0;
right: 0;
top: 0;
isolation: isolate;
display: flex;
align-items: center;
gap: 0.9em;
height: 2.6em;
padding: 0 0.8em 0 1.3em;
}
/* the frost: faded in as content scrolls underneath */
.gls-glass-header-on-scroll-bar::before {
content: "";
position: absolute;
inset: 0;
z-index: -1;
border-bottom: 1px solid rgb(255 255 255 / 0.28);
background: rgb(255 255 255 / 0.14);
-webkit-backdrop-filter: blur(0.8em) saturate(1.6);
backdrop-filter: blur(0.8em) saturate(1.6);
box-shadow: 0 0.5em 1.2em -0.6em rgb(0 0 0 / 0.55);
opacity: 0;
animation: gls-glass-header-on-scroll-frost 9s ease infinite;
}
.gls-glass-header-on-scroll-logo {
display: flex;
align-items: center;
gap: 0.4em;
color: #fff;
font-size: 0.8em;
font-weight: 750;
letter-spacing: -0.01em;
text-decoration: none;
}
.gls-glass-header-on-scroll-logo i {
width: 1.1em;
height: 1.1em;
border-radius: 0.35em;
background: linear-gradient(135deg, color-mix(in srgb, var(--c) 40%, #fff), var(--c));
box-shadow: inset 0 1px 0 rgb(255 255 255 / 0.5);
}
.gls-glass-header-on-scroll-nav {
display: flex;
gap: 0.15em;
margin-left: auto;
}
.gls-glass-header-on-scroll-nav a {
padding: 0.45em 0.7em;
border-radius: 99em;
color: rgb(255 255 255 / 0.8);
font-size: 0.66em;
font-weight: 600;
text-decoration: none;
transition: background-color 0.25s ease, color 0.25s ease;
}
.gls-glass-header-on-scroll-nav a:hover { background: rgb(255 255 255 / 0.16); color: #fff; }
.gls-glass-header-on-scroll-cta {
padding: 0.5em 0.95em;
border-radius: 99em;
background: #fff;
color: color-mix(in srgb, var(--c) 60%, #0f172a);
font-size: 0.66em;
font-weight: 700;
text-decoration: none;
transition: scale 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.gls-glass-header-on-scroll-cta:hover { scale: 1.06; }
.gls-glass-header-on-scroll-bar a:focus-visible { outline: 2px solid #fff; outline-offset: 0.15em; }
@keyframes gls-glass-header-on-scroll-scroll {
0%, 10% { transform: translateY(0); }
40%, 60% { transform: translateY(-7em); }
90%, 100% { transform: translateY(0); }
}
@keyframes gls-glass-header-on-scroll-frost {
0%, 14% { opacity: 0; }
24%, 78% { opacity: 1; }
88%, 100% { opacity: 0; }
}
@media (prefers-reduced-motion: reduce) {
.gls-glass-header-on-scroll, .gls-glass-header-on-scroll *, .gls-glass-header-on-scroll::before, .gls-glass-header-on-scroll::after, .gls-glass-header-on-scroll *::before, .gls-glass-header-on-scroll *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--gls-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--gls-size. Every other dimension is inem, so the whole thing scales together. Currently previewing16px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.