body {
    margin: 0;
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
}

header {
    background: #2c3e50;
    color: white;
    padding: 40px 20px;
    text-align: center;
}

header h1 {
    margin-bottom: 10px;
    font-size: 36px;
}

.btn {
    display: inline-block;
    background: #25D366;
    color: white;
    padding: 12px 20px;
    text-decoration: none;
    border-radius: 5px;
    margin-top: 15px;
}

section {
    padding: 40px 20px;
    max-width: 900px;
    margin: auto;
}

.light {
    background: #f4f4f4;
}

ul {
    list-style: none;
    padding: 0;
}

ul li {
    padding: 8px 0;
}

footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 15px;
}