#sun {
    width: 225px;
    height: 225px;
    position: absolute;
    border-radius: 50%;
    overflow: hidden;
    top: 120px;
    left: 50px;
}
  
  #sun-face {
    width: 88px;
    height: 30px;
    top: 120px;
    left: 50px;
    background-image: url(sunface.svg);
    position: absolute;
}
  
#sun.day {
    background-image: url(sunbackground.svg);
}