body,html {
    margin:0;
    padding:0;
    width:100vw;
    height:100vw;
    overflow:hidden;
    
    background:#3333;
    color: #fff;
    }
    canvas {
    max-width: 100%;
    max-height: 100%;
    bottom: 0;
    left: 0;
    margin: auto;
    overflow: auto;
    position: fixed;
    right: 0;
    top: 0;
    object-fit: contain;
    }