Glowing Gradient Border
A rotating gradient border with a soft bloom of the same colors spilling out behind it. The glow is a blurred copy of the conic layer, so the light turns with the border instead of sitting still.
Also known as: animated glowing gradient border css, gradient border with glow, rotating glow border.
Glowing gradient
HTML
<div class="bdr-glowing-gradient-border">Glowing gradient</div>
CSS
@property --bdr-glowing-gradient-border-a {
syntax: "<angle>";
inherits: false;
initial-value: 0deg;
}
.bdr-glowing-gradient-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;
--fill: color-mix(in srgb, var(--c) 10%, #0b0f19);
--ring: conic-gradient(from var(--bdr-glowing-gradient-border-a), var(--c), color-mix(in oklch, var(--c), #d946ef 70%), color-mix(in oklch, var(--c), #22d3ee 70%), var(--c));
isolation: isolate;
color: #f1f5f9;
animation: bdr-glowing-gradient-border-spin 4s linear infinite;
}
.bdr-glowing-gradient-border::before,
.bdr-glowing-gradient-border::after {
content: "";
position: absolute;
z-index: -1;
border-radius: inherit;
pointer-events: none;
}
.bdr-glowing-gradient-border::before {
inset: 0.3em;
background: var(--ring);
filter: blur(0.9em);
opacity: 0.75;
}
.bdr-glowing-gradient-border::after {
inset: 0;
border: 0.16em solid transparent;
background: linear-gradient(var(--fill), var(--fill)) padding-box, var(--ring) border-box;
}
@keyframes bdr-glowing-gradient-border-spin {
to { --bdr-glowing-gradient-border-a: 360deg; }
}
@media (prefers-reduced-motion: reduce) {
.bdr-glowing-gradient-border, .bdr-glowing-gradient-border *, .bdr-glowing-gradient-border::before, .bdr-glowing-gradient-border::after, .bdr-glowing-gradient-border *::before, .bdr-glowing-gradient-border *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Tailwind CSS version
The same effect using Tailwind utility classes. No custom CSS or config needed.
<div class="relative isolate grid h-[8.5em] w-[15em] place-items-center font-semibold text-slate-100">
<div class="absolute inset-1 -z-10 overflow-hidden rounded-2xl opacity-75 blur-xl">
<div class="absolute inset-[-100%] animate-spin bg-[conic-gradient(#3b82f6,#d946ef,#22d3ee,#3b82f6)] [animation-duration:4s]"></div>
</div>
<div class="absolute inset-0 -z-10 overflow-hidden rounded-2xl p-[2px]">
<div class="absolute inset-[-100%] animate-spin bg-[conic-gradient(#3b82f6,#d946ef,#22d3ee,#3b82f6)] [animation-duration:4s]"></div>
<div class="relative h-full w-full rounded-[14px] bg-slate-950"></div>
</div>
Glowing gradient
</div>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.