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

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

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

#circle
{
  width: 100px;
  height: 100px;
  background: blue;
  border-radius: 50%;
}

#oval
{
  width: 100px;
  height: 50px;
  background: red;
  border-radius: 50%;
}

#triangle-up
{
  width: 0;
  height: 0;
  border-left: 25px solid transparent;
  border-right: 25px solid transparent;
  border-bottom: 50px solid green;
}

#triangle-right
{
  width: 0;
  height: 0;
  border-top: 25px solid transparent;
  border-bottom: 25px solid transparent;
  border-left: 50px solid black;
}