body {
    margin: 0;
    font-family: Arial, sans-serif;
    text-align: center;
    background: #f5f5f5;
    color: #333;
}

header {
    padding: 100px 20px;
    background: #111;
    color: white;
}

.btn {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 24px;
    background: #ffffff;
    color: #111;
    text-decoration: none;
    border-radius: 6px;
}

section {
    padding: 60px 20px;
}