html,
body {
  align-items: center;
  display: flex;
  justify-content: center;
  height: 100vh;
  width: 100vw;
  margin: 0;
  padding: 0;

  font-size: 1vmax;
  overflow: hidden;
}

#santa {
  position: absolute;
  animation: fly 15s linear infinite;
  width: 300px;
  z-index: 100;
}

@keyframes fly {
  0% {
    transform: rotateZ(0deg) translate(-75vw, -30vh);
  }
  100% {
    transform: rotateZ(90deg) translate(500vw, -30vh);
  }
}

#scene {
  text-align: center;
  height: 100vh;
  width: 100vw;
  margin: 0;
  padding: 0;
  background: black;
}

.background {
  margin-left: -10vw;
  margin-top: -10vh;
  width: 120vw;
}
.background img {
  height: 100vh;
  width: 100%;
}

.snow {
  width: 120vw;
}
.snow > * {
  margin-left: -20vw;
  transform: scale(2);
}
.snow.back {
  margin-top: 70vh;
}
.snow.front {
  margin-top: 83vh;
}
.snow img {
  height: 20vh;
  width: 60vw;
}
#snow-reverse {
  transform: scale(-2, 2);
}

.tree-container {
  position: absolute;
}

#tree {
  height: 60vh;
  width: 30vw;
  margin-top: 40vh;
  margin-left: 35vw;
}