body{
    background: #222;
    margin: 0;
}

canvas{
    position: absolute;
    left: 0;
    top: 0;
}

#hud{
    opacity: 0;
    transition: .5s;
    position: absolute;
    left: 0;
    top: 0;
    width: 100vw;
    height: 4px;
    background: transparent;
    z-index: 10;
}