AI CSS Animations

Door Open Card Hover

A panelled door swings inward on its hinge to show a lit room and a message behind it. One element rotates on its left edge and dims as it turns; the frame and room stay flat.

Also known as: door opening animation css, 3d door hover, swing open reveal.

Come in We're open
No. 7

HTML

<div class="hfx-door-open-card">
  <div class="hfx-door-open-card-room">
    <strong>Come in</strong>
    <span>We're open</span>
  </div>
  <div class="hfx-door-open-card-door">
    <span class="hfx-door-open-card-plate">No. 7</span>
    <span class="hfx-door-open-card-knob"></span>
  </div>
</div>

CSS

.hfx-door-open-card {
  --c: var(--hfx-color, #3b82f6);
  font-size: var(--hfx-size, 16px);
  position: relative;
  width: 7.2em;
  height: 10em;
  padding: 0.4em 0.4em 0;
  border-radius: 0.5em 0.5em 0 0;
  background: color-mix(in srgb, var(--c) 55%, #000);
  perspective: 25em;
  font-family: system-ui, sans-serif;
}
.hfx-door-open-card::after {
  content: "";
  position: absolute;
  left: -0.6em;
  right: -0.6em;
  bottom: -0.3em;
  height: 0.3em;
  border-radius: 0.15em;
  background: color-mix(in srgb, var(--c) 40%, #000);
}
.hfx-door-open-card-room {
  display: grid;
  place-content: center;
  gap: 0.15em;
  height: 100%;
  text-align: center;
  border-radius: 0.25em 0.25em 0 0;
  background: radial-gradient(130% 90% at 50% 100%, #fffbeb, #fde68a 55%, #f59e0b);
  color: color-mix(in srgb, var(--c) 45%, #000);
  padding-left: 1.2em;
}
.hfx-door-open-card-room strong {
  font-size: 1.2em;
}
.hfx-door-open-card-room span {
  font-size: 0.75em;
  opacity: 0.8;
}
.hfx-door-open-card-door {
  position: absolute;
  inset: 0.4em 0.4em 0;
  border-radius: 0.25em 0.25em 0 0;
  background: linear-gradient(90deg, color-mix(in srgb, var(--c) 80%, #000), var(--c) 0.8em);
  transform-origin: 0 50%;
  transition: transform 0.75s cubic-bezier(0.55, 0, 0.2, 1), filter 0.75s ease;
}
.hfx-door-open-card-door::before,
.hfx-door-open-card-door::after {
  content: "";
  position: absolute;
  left: 0.75em;
  right: 0.75em;
  border: 1px solid color-mix(in srgb, #fff 30%, transparent);
  border-radius: 0.2em;
  background: color-mix(in srgb, var(--c) 88%, #000);
  box-shadow: inset 0 0.25em 0.4em color-mix(in srgb, #000 25%, transparent);
}
.hfx-door-open-card-door::before {
  top: 1.9em;
  height: 2.5em;
}
.hfx-door-open-card-door::after {
  top: 5em;
  bottom: 0.9em;
}
.hfx-door-open-card-plate {
  position: absolute;
  top: 0.55em;
  left: 50%;
  padding: 0.05em 0.45em;
  border-radius: 0.3em;
  background: #fef3c7;
  color: #78350f;
  font-size: 0.7em;
  font-weight: 700;
  white-space: nowrap;
  transform: translateX(-50%);
}
.hfx-door-open-card-knob {
  position: absolute;
  top: 55%;
  right: 0.5em;
  width: 0.6em;
  height: 0.6em;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fffbe6, #d4a017);
  box-shadow: 0 0.1em 0.15em color-mix(in srgb, #000 35%, transparent);
}
.hfx-door-open-card:hover .hfx-door-open-card-door {
  transform: rotateY(84deg);
  filter: brightness(0.7);
}

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

Customizing this snippet

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