#puzzle {
    margin: auto;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
#difficulty{
  top:93%;
  left:1%;
  width:30px;
  height:25px;
  position: absolute; 
}
#solve{
  top:93%;
  left:10%;
  width:60px;
  height:30px;
  position: absolute; 
}