#canvas{
  position: relative;
  background-color: rgb( 27, 71, 143 );
  width: 50vmin;
  height: 50vmin;
  margin: 20vmin auto;
    
}

#secondring{
  background-color: rgb( 181, 80, 168 );
  width: 30vmin;
  height: 30vmin;
  top: 14vmin;
  left: 10vmin;
  position: absolute;
  
}

#innerring{
  background-color: rgb( 195, 35, 22 );
  width: 18vmin;
  height: 18vmin;
  top: 23vmin;
  left: 16vmin;
  position: absolute;
}