Move Left to Right: CSS Keyframe Animation

Move Left to Right

Glides from side to side and leans into each move, easing to a stop at both ends. Two animations on the separate translate and rotate properties, so the lean peaks when the speed does.

Also known as: css animation move left to right, side to side animation, back and forth loop.

Move

Color Base size 16px Dark background

HTML

<div class="kfa-move-left-to-right">Move</div>

CSS

.kfa-move-left-to-right {
  --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-move-left-to-right-glide 3s ease-in-out infinite,
    kfa-move-left-to-right-lean 3s ease-in-out infinite;
}
@keyframes kfa-move-left-to-right-glide {
  0%, 100% { translate: -5em 0; }
  50% { translate: 5em 0; }
}
@keyframes kfa-move-left-to-right-lean {
  0%, 50%, 100% { rotate: 0deg; }
  25% { rotate: 7deg; }
  75% { rotate: -7deg; }
}

@media (prefers-reduced-motion: reduce) {
  .kfa-move-left-to-right, .kfa-move-left-to-right *, .kfa-move-left-to-right::before, .kfa-move-left-to-right::after, .kfa-move-left-to-right *::before, .kfa-move-left-to-right *::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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