html,
body {
    width: 100dvw;
    height: 100dvh;
}

body {
    background: #0F0F0F;
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

canvas {
    width: calc(100% - 2px);
    /*height: 100%;*/
    max-width: 100%;
    max-height: 100%;
    /*
    set aspect-ratio to canvas width/height
    */
    /*aspect-ratio: 640/480;*/
    /*aspect-ratio: 400/400;*/
}

@media (min-width: 767px) {
    canvas {
        width: auto;
        height: 100%;
    }  
}