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

.container {
    max-width: 600px;
    text-align: center;
    padding: 20px;
    background: linear-gradient(145deg, #ffffff, #d9d9d9);
    border-radius: 15px;
    box-shadow: 5px 5px 10px #a3a3a3, -5px -5px 10px #ffffff;
}

footer {
    margin-top: 20px;
    font-size: 14px;
}

button {
    margin-top: 20px;
    padding: 10px 15px;
    font-size: 16px;
    cursor: pointer;
}