.holo-card {
  position: relative;
  overflow: hidden;
  z-index: 0;
}

.holo-card::before {
  content: '';
  position: absolute;
  top: -100%;
  left: -100%;
  width: 200%;
  height: 200%;
  background: linear-gradient(
    145deg,
    transparent 0%,
    rgba(240, 240, 240, 0.0) 20%,
    rgba(220, 220, 220, 0.1) 40%,
    rgba(255, 255, 255, 0.2) 50%,
    rgba(220, 220, 220, 0.1) 60%,
    rgba(240, 240, 240, 0.0) 80%,
    transparent 100%
  );
  animation: holo-sweep 3s infinite ease-in-out;
  pointer-events: none;
  z-index: 1;
}