Rotating Gradient Border Button
A dark button ringed by a conic gradient border that starts to rotate on hover, with a blurred copy glowing behind it. The angle is a registered @property, so it turns smoothly.
Also known as: animated gradient border button, conic gradient border, glowing border button.
HTML
<button class="btn-gradient-border-spin"><span class="btn-gradient-border-spin-face">Generate</span></button>
CSS
@property --btn-gradient-border-spin-a {
syntax: "<angle>";
inherits: true;
initial-value: 0deg;
}
.btn-gradient-border-spin {
--c: var(--btn-color, #3b82f6);
position: relative;
isolation: isolate;
padding: 2px;
border: 0;
border-radius: 0.7em;
background: transparent;
font: 600 var(--btn-size, 18px)/1.2 system-ui, sans-serif;
cursor: pointer;
}
.btn-gradient-border-spin::before,
.btn-gradient-border-spin::after {
content: "";
position: absolute;
inset: 0;
z-index: -1;
border-radius: inherit;
background: conic-gradient(from var(--btn-gradient-border-spin-a),
var(--c),
color-mix(in srgb, var(--c) 35%, #ec4899),
color-mix(in srgb, var(--c) 35%, #facc15),
color-mix(in srgb, var(--c) 35%, #22d3ee),
var(--c));
}
.btn-gradient-border-spin::before {
filter: blur(0.7em);
opacity: 0;
transition: opacity 0.4s ease;
}
.btn-gradient-border-spin-face {
display: block;
padding: 0.75em 1.6em;
border-radius: calc(0.7em - 2px);
background: color-mix(in srgb, var(--c) 12%, #0b0e14);
color: #fff;
}
.btn-gradient-border-spin:is(:hover, :focus-visible) {
animation: btn-gradient-border-spin-turn 2.4s linear infinite;
}
.btn-gradient-border-spin:is(:hover, :focus-visible)::before { opacity: 0.75; }
@keyframes btn-gradient-border-spin-turn {
to { --btn-gradient-border-spin-a: 360deg; }
}
@media (prefers-reduced-motion: reduce) {
.btn-gradient-border-spin, .btn-gradient-border-spin *, .btn-gradient-border-spin::before, .btn-gradient-border-spin::after, .btn-gradient-border-spin *::before, .btn-gradient-border-spin *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--btn-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--btn-size. Every other dimension is inem, so the whole thing scales together. Currently previewing18px. - 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.