body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f0f0f0;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em;
}

main {
    max-width: 800px;
    margin: 20px auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

button {
    padding: 10px;
    font-size: 16px;
    cursor: pointer;
}

/* Responsive Styles */
@media only screen and (max-width: 600px) {
    main {
        padding: 10px;
    }
}