body {
  margin: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #666666;
  overflow: hidden;
  padding: 45px 0;
}
.container {
  font-size: 10px;
  width: 40em;
  height: 40em;
  position: relative;
}
.sun {
  position: absolute;
  top: 15em;
  left: 15em;
  width: 10em;
  height: 10em;
  background-color:
    #ffae00;
  border-radius: 50%;
  box-shadow: 0 0 3em
    yellow;
  }
.earth,.moon {
  position: absolute;
  border-style: solid;
  border-color: white
    transparent
    transparent 
    transparent;
  border-width: 0.1em 0.1
    em 0 0;
  border-radius: 50%;
}
.earth {
  top: 5em;
  left: 5em;
  width: 30em;
  height: 30em;
  animation: orbit 36.5s
    linear infinite;    
}
.moon {
  top: 0;
  right: 0;
  width: 8em;
  height: 8em;
  animation: orbit 2.7s
    linear infinite
}
.earth::before,
.moon::before {
  content: '';
  position: absolute;
  border-radius: 50%;
}
.earth::before {
  top: 2.8em;
  right: 2.8em;
  width: 3em;
  height: 3em;
  background-color: aqua;
}
.moon::before {
  top: 0.8em;
  right: 0.2em;
  left: 1.2em;
  width: 1.2em;
  height: 1.2em;
  background-color:
    rgb(235, 232, 96);
}
@keyframes orbit {
  to {
    transform: rotate(
      360deg);
  }
}