.center{width:auto;height:auto;max-width:100vmin;max-height:100vmin;position:relative;margin:0 auto;top:50%;transform:translateY(-50%)}
.center .canvas{width:100%;height:100%}
.center .canvas canvas{display:block;width:100% !important;height:100% !important;list-style:none;text-decoration:none;outline:none}
.center .shadow{background-repeat:no-repeat;width:100%;height:100%;pointer-events:none;position:absolute;top:0;left:0;background-image:url("static/images/shadow.png");background-size:89% 89%;background-position:50%}