Create #canvas {     border-style: solid;     border-width: medium;     padding-left: 0;     padding-right: 0;     margin-left: auto;     margin-right: auto;     display: block; }   #new_game {     padding-left: 0;     padding-right: 0;     margin-top: 10px;     margin-left: auto;     margin-right: auto;     display: block; }