.snow {
  display: flex;
  justify-content: space-between;

  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;

  pointer-events: none;
}

.snow__flake {
  color: #c1dcec;

  position: relative;
  top: -1.5em;

  animation-name: snowfall;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;

  will-change: transform;
}

@keyframes snowfall {
  from {
    transform: translateY(0);
  }

  to {
    transform: translateY(calc(100vh + 1.5em));
  }
}