Rainbow Background
A full spectrum gradient whose hues roll continuously, the RGB look from gaming setups. A registered @property number turns every stop round the color wheel, so nothing slides.
Also known as: css background rainbow animation, rgb background animation css, hue shift background.
HTML
<div class="bgx-rainbow" aria-hidden="true"></div>
CSS
@property --bgx-rainbow-h {
syntax: "<number>";
inherits: false;
initial-value: 0;
}
.bgx-rainbow {
--c: var(--bgx-color, #3b82f6);
font-size: var(--bgx-size, 16px);
position: absolute;
inset: 0;
overflow: hidden;
background: linear-gradient(120deg,
oklch(from var(--c) 0.7 0.19 calc(h + var(--bgx-rainbow-h))),
oklch(from var(--c) 0.72 0.18 calc(h + var(--bgx-rainbow-h) + 60)),
oklch(from var(--c) 0.8 0.17 calc(h + var(--bgx-rainbow-h) + 120)),
oklch(from var(--c) 0.76 0.15 calc(h + var(--bgx-rainbow-h) + 180)),
oklch(from var(--c) 0.7 0.17 calc(h + var(--bgx-rainbow-h) + 240)),
oklch(from var(--c) 0.68 0.2 calc(h + var(--bgx-rainbow-h) + 300)));
animation: bgx-rainbow-roll 8s linear infinite;
}
@keyframes bgx-rainbow-roll {
to { --bgx-rainbow-h: 360; }
}
@media (prefers-reduced-motion: reduce) {
.bgx-rainbow, .bgx-rainbow *, .bgx-rainbow::before, .bgx-rainbow::after, .bgx-rainbow *::before, .bgx-rainbow *::after {
animation-duration: 0.01ms !important;
animation-iteration-count: 1 !important;
transition-duration: 0.01ms !important;
}
}Customizing this snippet
- Color: set
--bgx-coloron the element or a parent. Currently previewing#3b82f6. - Pattern scale: set
--bgx-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.