*{margin:0;padding:0;box-sizing:border-box}#canvas1,body{background:black}#canvas1{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);border:5px solid white;max-width:100%;max-height:100%}img{display:none}#fullScreenButton{position:absolute;font-size:20px;padding:10px;top:10px;left:50%;transform:translateX(-50%)}