body {
    margin:0;
    width:100vw;
    height:100vh;

    background-color: #111;
    overflow:hidden;
}

#ui {
    width:100vw;
    height:100vh;
    position:fixed;
    left:0;
    top:0;
    color:#efefef;
}
canvas {
    width:calc(100vw)
}