Shine Border
A bright glint sweeps across a gradient border every few seconds, with a faint sheen crossing the box behind it. The glint is a second background layer whose position animates, masked to the edge.
Also known as: shiny border css, border shimmer animation, light sweep border css.
Shine border
HTML
<div class="bdr-shine-border">Shine border</div>
CSS
.bdr-shine-border {
--c: var(--bdr-color, #3b82f6);
font-size: var(--bdr-size, 16px);
position: relative;
display: grid;
place-items: center;
width: 15em;
height: 8.5em;
border-radius: 1em;
font-family: system-ui, sans-serif;
font-weight: 600;
background: color-mix(in srgb, var(--c) 10%, #0b0f19);
color: #f1f5f9;
}
.bdr-shine-border::before,
.bdr-shine-border::after {
content: "";
position: absolute;
inset: 0;
border-radius: inherit;
pointer-events: none;
animation: bdr-shine-border-sweep 3.5s cubic-bezier(0.45, 0, 0.2, 1) infinite;
}
.bdr-shine-border::before {
padding: 0.16em;
background:
linear-gradient(110deg, transparent 44%, #fff 50%, transparent 56%) 100% 0 / 250% 100% no-repeat,
linear-gradient(135deg, color-mix(in srgb, var(--c) 40%, transparent), var(--c) 35% 65%, color-mix(in srgb, var(--c) 40%, transparent));
-webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
-webkit-mask-composite: xor;
mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
}
.bdr-shine-border::after {
background: linear-gradient(110deg, transparent 44%, color-mix(in srgb, #fff 8%, transparent) 50%, transparent 56%) 100% 0 / 250% 100% no-repeat;
}
@keyframes bdr-shine-border-sweep {
0% { background-position: 100% 0, 0 0; }
60%, 100% { background-position: 0% 0, 0 0; }
}
@media (prefers-reduced-motion: reduce) {
.bdr-shine-border, .bdr-shine-border *, .bdr-shine-border::before, .bdr-shine-border::after, .bdr-shine-border *::before, .bdr-shine-border *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--bdr-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--bdr-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.