body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}
header {
    background: #222;
    color: white;
    padding: 20px;
    text-align: center;
}
h1 {
    margin: 0;
}
section {
    padding: 20px;
}
.btn {
    display: inline-block;
    padding: 10px 15px;
    margin: 5px;
    text-decoration: none;
    background: #007BFF;
    color: white;
    border-radius: 5px;
}
.btn.primary {
    background: #28a745;
}
footer {
    text-align: center;
    padding: 10px;
    background: #222;
    color: white;
}