#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;
}

#trapezoid {
      border-bottom: 100px solid red;
      border-left: 25px solid transparent;
      border-right: 25px solid transparent;
      height: 0;
  		width: 100px;
}
  #star-six {
      width: 0;
      height: 0;
      border-left: 50px solid transparent;
      border-right: 50px solid transparent;
      border-bottom: 100px solid red;
      position: relative;
    }
    #star-six:after {
      width: 0;
      height: 0;
      border-left: 50px solid transparent;
      border-right: 50px solid transparent;
    }    
   #infinity {
      position: relative;
      width: 212px;
      height: 100px;
      box-sizing: content-box;
    }
    #infinity:before,
    #infinity:after {
      content: "";
      box-sizing: content-box;
      position: absolute;
      top: 0;
      left: 0;
      width: 60px;
      height: 60px;
      border: 20px solid red;
      border-radius: 50px 50px 0 50px;
      transform: rotate(-45deg);
    }
    #infinity:after {
      left: auto;
      right: 0;
      border-radius: 50px 50px 50px 0;
      transform: rotate(45deg);
    }