.container {
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  z-index: 1;
}

.particle {
  position: absolute;
  border-radius: 50%;
  animation: drift linear infinite;
}

@keyframes drift {
  0% {
    transform: translate(0, 0);
    opacity: 0;
  }
  10% {
    opacity: var(--opacity, 0.5);
  }
  90% {
    opacity: var(--opacity, 0.5);
  }
  100% {
    transform: translate(var(--drift, 50px), -100vh);
    opacity: 0;
  }
}