html,body{
    margin:0;
    padding:0;
    height: 100%;
    background:"#000";
    display:flex;
    justify-content:center;
    align-items:center;
    overflow:hidden;
}
canvas{
    display:block;
    border:3px solid #ffffff;
    box-sizing:border-box;
    touch-action:none;
}