* {outline: none;
    user-select: none;
    cursor: default;}
body {position: absolute;
    width: 100%;
    height: 100%;
    font-family: Arial;
    font-size: 15px;
    background: #f1f1f1;
    margin: 0;}
#container {display: block;
    position: absolute;
    width: 700px;
    height: 700px;
    left: calc(50% - 350px);
    top: calc(50% - 350px);
    overflow: hidden;
    box-shadow: 0 5px 40px rgba(0,0,0,0.5);
    background: #fff;}
#container > canvas {position: absolute;
    left: 0;
    top: 0;
    z-index: 0;
    transform: translate3d(0,0,0);}
#container > div {display: block;
    position: absolute;
    z-index: 1;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.1);
    line-height: 700px;
    text-align: center;
    font-size: 40px;
    text-shadow: 0 0 20px #fff;}
#container > div#screen_1 {font-size: 50px;
    color: #fff;
    text-shadow: 0 0 50px #000, 0 0 50px #000;}
#container > div[state="hidden"] {display: none;}