body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}
header {
    background: #0070f3;
    color: white;
    padding: 2rem;
    text-align: center;
}
.btn {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.75rem 1.5rem;
    background: white;
    color: #0070f3;
    text-decoration: none;
    border-radius: 4px;
    font-weight: bold;
}
section {
    padding: 2rem;
    background: white;
    margin: 1rem auto;
    max-width: 800px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
footer {
    text-align: center;
    padding: 1rem;
    background: #222;
    color: white;
}