html,
body {
    margin: 0;
    padding: 0;
    font-family: system-ui, sans-serif;
    background: #0f0f0f;
    color: #f1f1f1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-height: 100vh;
    width: 100%;
}

.chess-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

h1 {
    font-size: 2.5rem;
    margin: 0.2em 0;
}

p.subtitle {
    color: #888;
    margin: 0 0 2em;
}

#original {
    width: 100%;
    max-width: 640px;
    padding: 0 1em;
    box-sizing: border-box;
}

footer {
    margin-top: 3em;
    font-size: 0.85rem;
    color: #555;
}