* {
  padding: 0;
  margin: 0;
  overflow: hidden;
}

#sun {
  height: 100px;
  width: 100px;
  border-radius: 50px;

  position: absolute;
  top: 0;
  left: 40%;
  animation: sunrise 20s;
}
#sky {
  position: absolute;
  width: 100%;
  height: 40%;
  background-color: #6e44ff;
  animation: sky 25s;
}
#grass {
  background-color: #007200;
  height: 60%;
  width: 100%;
  bottom: 0;
  position: absolute;
}

@keyframes sunrise {
  0% {
    top: 90%;
    left: 0;
    background-color: #fca311;
  }
  30% {
    top: 0;
    left: 25%;
    background-color: #ffec01;
  }
  70% {
    top: 0;
    left: 75%;
    background-color: #ffba08;
  }
  100% {
    top: 90%;
    left: 100%;
    background-color: #f3722c;
  }
}

@keyframes sky {
  0% {
    background-color: #6e44ff;
  }
  10% {
    background-color: #bdb2ff;
  }
  20% {
    background-color: #cee9fc;
  }
  30% {
    background-color: #f2c8ff;
  }
  60% {
    background-color: #597eaa;
  }
  70% {
    background-color: #556f7a;
  }
  80% {
    background-color: #2e6171;
  }
  90% {
    background-color: #495057;
  }
  100% {
    background-color: #22223b;
  }
}