Breathe: CSS Keyframe Animation

Breathe

A slow inhale, a short hold, a slow exhale and a pause, five seconds a cycle, growing brighter as it fills. Suits meditation timers, idle states and ambient backgrounds. Scale plus opacity.

Also known as: breathing animation css, breathe in and out, calm pulse.

Breathe

Color Base size 16px Dark background

HTML

<div class="kfa-breathe">Breathe</div>

CSS

.kfa-breathe {
  --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-breathe-cycle 5s cubic-bezier(0.45, 0, 0.55, 1) infinite;
}
@keyframes kfa-breathe-cycle {
  0%, 92%, 100% { transform: scale(0.9); opacity: 0.65; }
  40%, 52% { transform: scale(1.1); opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .kfa-breathe, .kfa-breathe *, .kfa-breathe::before, .kfa-breathe::after, .kfa-breathe *::before, .kfa-breathe *::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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