body{background-color:#d3d3d3;position:relative}canvas{position:relative;left:calc(50% - 500px);top:10px;background-color:gray;border:1px solid #fff}#startButton{position:absolute;border:none;background:0 0;color:#fff;font:bold 48px arial;text-transform:uppercase;left:calc(50% - 50px);top:245px;user-select:none;cursor:pointer}#exitButton:hover,#restartButton:hover{background-color:#fff;color:#000}#exitButton,#restartButton{position:absolute;color:#fff;font:bold 20px arial;text-transform:uppercase;left:calc(50% - 50px);top:220px;border:1px solid #fff;padding:10px;border-radius:4px;cursor:pointer;background:0 0;display:none}#exitButton{top:280px;left:calc(50% - 25px)}