#red-box{background:red;}
#orange-box{background:orange;}
#yellow-box{background:yellow;}
#green-box{background:green;}
#black-box{background:black;}
#brown-box{background:brown;}

div{ height: 600px;
  width: 400px; 
  border-radius: 30%;
  margin:auto;
  margin-bottom:300px;}