#container div {
 height: 100px;
 width: 100px;
 border-radius: 50%;
 margin: auto;
 margin-bottom: 10px; 
}

#red {
 background: #ff0000;
}
#orange {
background:  #ff8400;
}
#yellow {
background: #eeff00;
}
#green {
background: #04ff00;
}
#blue {
background: #0000ff;
}
#purple {
background: #a200ff
}