Grain-On-Hover Photo

<!-- Grain-On-Hover Photo — static at rest, grain animates on hover/focus -->
<div class="nuda-ng2-hover-photo" tabindex="0">
  <div class="nuda-ng2-hover-photo__img" aria-hidden="true"></div>
  <div class="nuda-ng2-hover-photo__grain" aria-hidden="true"></div>
  <span class="nuda-ng2-hover-photo__caption">Hover / Focus</span>
</div>

.nuda-ng2-hover-photo {
  position: relative;
  width: 100%;
  max-width: 220px;
  height: 140px;
  border-radius: 12px;
  overflow: hidden;
  cursor: pointer;
  isolation: isolate;
  outline: none;
}

.nuda-ng2-hover-photo__img {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,#2a2e12,#09090b 70%);
  transition: filter .25s ease;
}

.nuda-ng2-hover-photo__grain {
  position: absolute;
  inset: -50%;
  width: 200%;
  height: 200%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 140px 140px;
  opacity: 0;
  mix-blend-mode: overlay;
  pointer-events: none;
  transition: opacity .2s ease;
}

.nuda-ng2-hover-photo__caption {
  position: absolute;
  left: 12px;
  bottom: 10px;
  z-index: 1;
  font-family: ui-sans-serif,system-ui,sans-serif;
  font-size: 12px;
  font-weight: 600;
  color: #fafafa;
  text-shadow: 0 1px 3px rgba(0,0,0,.6);
}

.nuda-ng2-hover-photo:hover .nuda-ng2-hover-photo__grain,.nuda-ng2-hover-photo:focus-visible .nuda-ng2-hover-photo__grain {
  opacity: .3;
  animation: _nuda-ng2hoverphoto-shift .5s steps(5) infinite;
}

.nuda-ng2-hover-photo:hover .nuda-ng2-hover-photo__img,.nuda-ng2-hover-photo:focus-visible .nuda-ng2-hover-photo__img {
  filter: brightness(.85) saturate(1.2);
}

.nuda-ng2-hover-photo:focus-visible {
  box-shadow: 0 0 0 2px #e4ff54,0 0 0 5px rgba(228,255,84,.25);
}

@keyframes _nuda-ng2hoverphoto-shift {
  0% {
    transform: translate3d(0,0,0);
  }
  25% {
    transform: translate3d(-8px,5px,0);
  }
  50% {
    transform: translate3d(6px,-7px,0);
  }
  75% {
    transform: translate3d(-5px,-3px,0);
  }
  100% {
    transform: translate3d(0,0,0);
  }
}

@media (prefers-reduced-motion:reduce) {
  .nuda-ng2-hover-photo:hover .nuda-ng2-hover-photo__grain,.nuda-ng2-hover-photo:focus-visible .nuda-ng2-hover-photo__grain {
    animation: none;
    opacity: .18;
  }
}