#square
{
  width: 50px;
  height: 50px;
  background:darkgreen;
}

#rectangle
{
  width: 175px;
  height: 83px;
  background: purple;
}

#diamond
{
  width: 50px;
  height: 50px;
  background: ;
  transform: rotate(45deg);
}

#circle
{
  width: 100px;
  height: 100px;
  background: blue;