header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 20px;
}

section {
    margin: 20px 0;
    padding: 20px;
    border: 1px solid #ddd;
    background-color: #f9f9f9;
    border-radius: 5px;
}

ul, ol {
    list-style: none;
    padding-left: 0;
}

li {
    margin-bottom: 10px;
}

a {
    text-decoration: none;
    color: #0078d4;
}

a:hover {
    text-decoration: underline;
}