html, body {
    margin: 0;
    padding: 0;
    background: #000;
    color: #ddd;
    font-family: monospace;
}

body {
    display: flex;
    justify-content: center;
}

#frame {
    width: 900px;
    max-width: 90vw;

    margin: 40px 0;
    padding: 32px;

    border: 1px solid #444;
    box-sizing: border-box;
}