AI CSS Animations

Sliding Checkmark Checkbox

Everything travels left to right: the fill wipes in from the left edge and the tick slides in behind it; unchecking wipes it out through the right edge. Swapping transform-origin keeps one direction.

Also known as: slide in checkmark, checkbox wipe animation, left to right checkbox fill.

HTML

<label class="chk-sliding-checkmark">
  <input type="checkbox">
  <span class="chk-sliding-checkmark-box">
    <span class="chk-sliding-checkmark-fill"></span>
    <svg viewBox="0 0 24 24" aria-hidden="true"><path d="M5.5 12.5l4 4L18.5 7.5"/></svg>
  </span>
  Include weekends
</label>

CSS

.chk-sliding-checkmark {
  --c: var(--chk-color, #3b82f6);
  font-size: var(--chk-size, 24px);
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.3;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.chk-sliding-checkmark input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: pointer;
  z-index: 1;
}
.chk-sliding-checkmark-box {
  position: relative;
  box-sizing: border-box;
  display: grid;
  place-items: center;
  flex: none;
  width: 1.375em;
  height: 1.375em;
  overflow: hidden;
  border: 0.125em solid color-mix(in srgb, currentColor 38%, transparent);
  border-radius: 0.3em;
  transition: border-color 0.2s ease 0.15s;
}
.chk-sliding-checkmark-fill {
  position: absolute;
  inset: 0;
  background: var(--c);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s cubic-bezier(0.65, 0, 0.35, 1);
}
.chk-sliding-checkmark-box svg {
  display: block;
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  position: relative;
  width: 0.9em;
  height: 0.9em;
  stroke: #fff;
  stroke-width: 3.2;
  opacity: 0;
  transform: translateX(-1.1em);
  transition: opacity 0.12s ease, transform 0s linear 0.15s;
}
.chk-sliding-checkmark input:checked + .chk-sliding-checkmark-box {
  border-color: var(--c);
  transition-delay: 0s;
}
.chk-sliding-checkmark input:checked + .chk-sliding-checkmark-box .chk-sliding-checkmark-fill {
  transform: scaleX(1);
  transform-origin: left;
}
.chk-sliding-checkmark input:checked + .chk-sliding-checkmark-box svg {
  opacity: 1;
  transform: none;
  transition: transform 0.45s cubic-bezier(0.34, 1.56, 0.64, 1) 0.12s, opacity 0.1s ease 0.12s;
}
.chk-sliding-checkmark input:focus-visible + .chk-sliding-checkmark-box {
  outline: 0.125em solid var(--c);
  outline-offset: 0.18em;
}

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

Customizing this snippet

  • Color: set --chk-color on the element or a parent. Currently previewing #3b82f6.
  • Size: set --chk-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 24px.
  • 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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