#canvas{
  position:relative;
  width:80vmin;
  height:80vmin;
  background-color: #556; 
}

#col2{
  top:0;
  left:27vmin;
  position:absolute;
  background-color:rgb(144,50,40);
  width:27vmin;
  height:80vmin;

}
#col3{
  top:0;
  left:53vmin;
  position:absolute;
  background-color:goldenrod;
  width:27vmin;
  height:80vmin;
  
}