body {
    background-color: #111;
    color: #eee;
    font-family: sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.container {
    text-align: center;
    padding: 20px;
    border: 2px solid #555;
    border-radius: 10px;
    background-color: #222;
}