Grainy Gradient Border: CSS Border Animation

Grainy Gradient Border

A thick, slowly turning gradient frame with a film grain texture over the whole box, the riso print look. The grain is an inline SVG turbulence filter blended with overlay, so there is no image file.

Also known as: noise gradient border css, grain texture border, grainy gradient css.

Grainy gradient

Color Base size 16px Dark background Hold hover state

HTML

<div class="bdr-grainy-gradient-border"><svg class="bdr-grainy-gradient-border-grain" aria-hidden="true"><filter id="bdr-grainy-gradient-border-noise"><feTurbulence type="fractalNoise" baseFrequency="0.85" numOctaves="3" stitchTiles="stitch"/><feColorMatrix values="2.4 0 0 0 -0.7 2.4 0 0 0 -0.7 2.4 0 0 0 -0.7 0 0 0 0 1"/></filter><rect width="100%" height="100%" filter="url(#bdr-grainy-gradient-border-noise)"/></svg>Grainy gradient</div>

CSS

@property --bdr-grainy-gradient-border-a {
  syntax: "<angle>";
  inherits: false;
  initial-value: 0deg;
}
.bdr-grainy-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);
  box-sizing: border-box;
  isolation: isolate;
  border: 0.34em solid transparent;
  background:
    linear-gradient(var(--fill), var(--fill)) padding-box,
    conic-gradient(from var(--bdr-grainy-gradient-border-a), var(--c), color-mix(in oklch, var(--c), #f97316 75%), color-mix(in oklch, var(--c), #ec4899 80%), var(--c)) border-box;
  color: #f8fafc;
  animation: bdr-grainy-gradient-border-spin 8s linear infinite;
}
.bdr-grainy-gradient-border-grain {
  position: absolute;
  inset: -0.34em;
  width: calc(100% + 0.68em);
  height: calc(100% + 0.68em);
  clip-path: inset(0 round 1em);
  mix-blend-mode: overlay;
  opacity: 0.5;
  pointer-events: none;
}
@keyframes bdr-grainy-gradient-border-spin {
  to { --bdr-grainy-gradient-border-a: 360deg; }
}

@media (prefers-reduced-motion: reduce) {
  .bdr-grainy-gradient-border, .bdr-grainy-gradient-border *, .bdr-grainy-gradient-border::before, .bdr-grainy-gradient-border::after, .bdr-grainy-gradient-border *::before, .bdr-grainy-gradient-border *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

Customizing this snippet

Color: set --bdr-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --bdr-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
Speed: change the duration on the transition or animation shorthand. 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.

Grainy Gradient Border

HTML

CSS

Customizing this snippet

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