#canvas,body,html{height:100%;width:100%}*{margin:0;padding:0;box-sizing:border-box}body,html{background-color:#000;font-family:sans-serif}.back{position:absolute;left:5%;top:30px;text-decoration:none;color:#fff;background-color:rgba(0,0,0,0)}#canvas{position:fixed;overflow:hidden;touch-action:none}.wrapper{width:100%;padding-top:100px}.item{width:50%;max-width:500px;margin:0 auto 150px}.item-inner{padding-top:100%}