html, body {
    margin: 0;
    height: 100%;
    background-color: black;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

#canvas {
    position: absolute;
    width: 100%;
    height: 100%;
    touch-action: none;
}

#title {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 2em;
    font-weight: bold;
    text-shadow: 0 0 5px rgba(0, 0, 0, 1.0);
}

#forward {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 40px;
}

#backward {
    position: absolute;
    top: 20px;
    right: 80px;
    width: 50px;
    height: 40px;
}

#overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 2em;
    font-weight: bold;
    text-shadow: 2px 2px 3px rgba(0, 0, 0, 0.8);
    pointer-events: none;
    line-height: 2.0;
}