#canvas{
  position: relative;
  width: 80vmin;
  height: 80vmin;
  background-color: rgb(80,87,90);
  margin: 0 auto;
}
#col2{
  left: 27vmin;
  position: absolute;
  background-color: rgb(142, 65, 49);
  width: 27vmin;
  height: 80vmin;
  
}
#col3{
  top:0;
  left:52vmin;
  position: absolute;
  background-color: rgb(210 ,141 ,93 );
  width: 27vmin;
  height: 80vmin;
}