#canvas {

  width: 60vmin;
  height: 80vmin;
  margin: 20vmin auto;
  position: relative;
  background-color: #4b58bf;


}

#secondring {

  position: absolute;
  width: 45vmin;
  height: 59vmin;
  margin: 1vmin auto;
  left: 0vmin;
  top: 20vmin;
  background-color: #6ba252;

}

#third {

  position: absolute;
  width: 24vmin;
  height: 27vmin;
  
  left: 0vmin;
  top: 53vmin;
  background-color: #ce5c48;

}