#canvas{
  position: relative;
  width: 80vmin;
  height: 80vmin;
  background-color: rgb(82, 89, 98);
  margin: 0 auto;
}

#col2{
  top: 0;
  position: absolute;
  background-color: rgb(144, 68, 51);
  width: 27vmin;
  height: 80vmin;
  left: 27vmin;
}

#col3{
  top: 0;
  position: absolute;
  background-color: rgb(203, 144, 93);
  width: 27vmin;
  height: 80vmin;
  left: 54vmin;
}