#red-box
{
  background: red; 
  
} 

#orange-box
{
  background: orange; 
  
} 
#yellow-box
{
  background: yellow; 
  
} 
#green-box
{
  background: green; 
  
} 
#blue-box
{
  background: blue; 
  
} 
#violet-box
{
  background: violet; 
  
}

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