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

header {
    background-color: #4CAF50;
    color: white;
    padding: 20px 0;
}

main {
    margin: 20px;
}

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

footer {
    margin-top: 40px;
    padding: 10px 0;
    background-color: #ddd;
}