body {
    font-family: 'Arial', sans-serif;
    background-color: #f4f4f4;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

main {
    text-align: center;
    background-color: #ffffff;
    padding: 2em;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

h1 {
    color: #333;
}

#mensagem {
    color: #666;
    font-size: 1.2em;
}

button {
    background-color: #007bff;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 1em;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 20px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}