body {
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f0f0;
    margin: 0;
    transition: background-color 0.3s;
}

body[data-theme="dark"] {
    background-color: #121212;
}