body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    color: #333;
}

header {
    background: #007bff;
    color: white;
    padding: 40px;
    text-align: center;
}

section {
    padding: 20px;
    max-width: 700px;
    margin: 0 auto;
}

button {
    padding: 10px 20px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}