body {
    height: 100vh;
    margin: 0;
    width: 100vw;
}
#game-shell {
    display: flex;
    height: 100%;
    position: fixed;
    width: 100%;
}
#game-overlay {
    height: 0;
    position: absolute;
    width: 0;
}
#background-img {
    background-size: cover;
    bottom: -10%;
    height: 110%;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    width: 100%;
}
#block-page,
#scroll-area {
    height: 100%;
    position: absolute;
    width: 100%;
}
#block-page {
    left: 0;
    margin: auto;
    top: 0;
}