Spotlight Cutout

<!-- Spotlight Cutout — dim everything except a target element -->
<div class="nuda-spot">
  <!-- Your page content here -->
  <button class="nuda-spot__btn">Save</button>

  <!-- Overlay with a hole punched at the target -->
  <div class="nuda-spot__bg"></div>
  <div class="nuda-spot__hole"></div>
</div>

.nuda-spot {
  position: relative;
  width: 130px;
  height: 90px;
  background: linear-gradient(135deg,#1a1a1f,#0e0e10);
  border-radius: 8px;
  overflow: hidden;
}

.nuda-spot__bg {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.7);
  backdrop-filter: blur(2px);
  -webkit-mask: radial-gradient(circle 22px at 65% 50%,transparent 18px,black 22px);
  mask: radial-gradient(circle 22px at 65% 50%,transparent 18px,black 22px);
}

.nuda-spot__hole {
  position: absolute;
  left: 65%;
  top: 50%;
  width: 44px;
  height: 44px;
  border: 2px solid #e4ff54;
  border-radius: 8px;
  transform: translate(-50%,-50%);
  box-shadow: 0 0 20px rgba(228,255,84,.4);
  animation: _sp-pulse 2s ease-in-out infinite;
}

.nuda-spot__btn {
  position: absolute;
  left: 65%;
  top: 50%;
  transform: translate(-50%,-50%);
  padding: 4px 10px;
  background: #e4ff54;
  color: #09090b;
  font: 700 9px ui-sans-serif,system-ui;
  border-radius: 5px;
  pointer-events: none;
}

@keyframes _sp-pulse {
  0%,100% {
    box-shadow: 0 0 12px rgba(228,255,84,.3);
  }
  50% {
    box-shadow: 0 0 24px rgba(228,255,84,.6);
  }
}