Blob Morph: CSS Keyframe Animation

Blob Morph

The square melts into a slowly shifting blob, its corners swelling and shrinking on a six second loop. Nice behind an avatar or a hero image. Eight-value border-radius does all the shaping.

Also known as: blob animation css, morphing shape css, organic blob.

Blob

Color Base size 16px Dark background

HTML

<div class="kfa-blob-morph">Blob</div>

CSS

.kfa-blob-morph {
  --c: var(--kfa-color, #3b82f6);
  font-size: var(--kfa-size, 16px);
  display: grid;
  place-items: center;
  width: 5.5em;
  height: 5.5em;
  border-radius: 1em;
  background: var(--c);
  color: #fff;
  font-family: system-ui, sans-serif;
  font-weight: 700;
  box-shadow: 0 0.6em 1.4em -0.6em color-mix(in srgb, var(--c) 70%, transparent);
  animation: kfa-blob-morph-melt 6s ease-in-out infinite;
}
@keyframes kfa-blob-morph-melt {
  0%, 100% { border-radius: 42% 58% 62% 38% / 44% 40% 60% 56%; transform: rotate(0deg); }
  33% { border-radius: 68% 32% 46% 54% / 34% 56% 44% 66%; transform: rotate(10deg); }
  66% { border-radius: 36% 64% 30% 70% / 58% 32% 68% 42%; transform: rotate(-8deg); }
}

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

Customizing this snippet

Color: set --kfa-color on the element or a parent. Currently previewing #3b82f6.
Base size: set --kfa-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.

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