.snow {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
  overflow: hidden;
  display: none;
}

.winter .snow {
  display: block;
}

.snowflake {
  position: absolute;
  top: -20px;
  color: white;
  animation-name: fall;
  animation-duration: 8s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}

@keyframes fall {
  0% {
    transform: translateY(-20px);
  }
  100% {
    transform: translateY(110vh);
  }
}