body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f5f5;
    color: #222;
}

header,
main,
footer {
    max-width: 1100px;
    margin: auto;
    padding: 20px;
}

header {
    text-align: center;
}

section {
    margin: 40px 0;
}

.game-container {
    width: 100%;
    aspect-ratio: 16 / 9;

    border: 2px solid #bbb;
    border-radius: 8px;

    display: flex;
    justify-content: center;
    align-items: center;

    background: white;
}

#tutorial img {
    max-width: 500px;
    width: 100%;
    border-radius: 8px;
    display: block;
}

#tutorial a {
    text-decoration: none;
    color: inherit;
}

footer {
    text-align: center;
    color: gray;
}