#canvas{
  position: relative;
  width:80vmin;
  height:80vmin;
  background-color: #202926;
  margin:0 auto;
}
  


#col2{
  top:0;
  left: 27vmin;
  position: absolute;
  background-color: brown;
  width: 27vmin;
  height: 80vmin;
}

#col3{
  top:0;
  left: 53vmin;
  position: absolute;
  background-color: #a0a52a;
  width: 27vmin;
  height: 80vmin;
  
}