html, body {
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
    display: flex;
    justify-content: center;
    align-items: center;
}

html {  
    flex-direction: column;
}

body {
    flex-direction: row;
    overflow: hidden;
    touch-action: none;
    background: Silver;
    filter: drop-shadow(0 0 0.75rem grey);
}

canvas {
    width: 100%;
    height: 100%;
}