html,body{margin:0;padding:0;overflow:hidden;touch-action:none}div#vieport{position:fixed;width:100%;height:100%}div#vieport>canvas{display:block;width:100%;height:100%;border:none}#overlay{position:absolute;left:20%;top:1%;width:60%;z-index:3;text-align:center}.store-button{width:20%;height:6%;display:inline-block;vertical-align:top;box-sizing:border-box;border:1px solid transparent;border-radius:4px;background-color:#000;border-color:#a6a6a6}.store-button:hover{background-color:#04421d;transition:background-color .2s ease,border .2s ease}