* {
  margin: 0;
  box-sizing: border-box;
}
body {
  height: 100vh;
  background: linear-gradient(#12a7f9, #008aef);
  overflow: hidden;
}
.snowflake {
  position: absolute;
  background-image: url("snowflake-image.svg");
  background-size: cover;
  border-radius: 50px;
  animation: fall 2s linear infinite;
}
@keyframes fall {
  0% {
    transform: translate(50%, 50%);
    opacity: 1;
  }
  100% {
    transform: translate(50%, 1000%);
    opacity: 0;
  }
}