body {
    margin:0;
    background:#111;
    color:#fff;
    font-family:sans-serif;
    overflow:hidden;               /* hide scrollbars on mobile */
    display:flex;
    flex-direction:column;
    align-items:center;
    justify-content:center;
    height:100vh;
}
canvas {
    background:#000;
    border:2px solid #555;
}
#scoreBoard {
    margin-bottom:10px;
    font-size:1.5rem;
    user-select:none;
}