#outer {
  width: 200px;
  height: 500px;
  background-color: black;

  padding-top: 30px;      
  padding-bottom: 30px;
  margin-left: 500px;
  border-radius: 20px;
}

#first, #second, #third {
  width: 150px;
  height: 150px;
  border-radius: 50%;

  margin: 20px auto;    
}

#first {
  background-color: red;
}

#second {
  background-color: yellow;
}

#third {
  background-color: green;
}