body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}
header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}
section {
    padding: 2rem;
    margin: 1rem 0;
    background: #fff;
}
h1, h2, h3 {
    color: #333;
}
a {
    color: #007BFF;
    text-decoration: none;
}
a:hover {
    text-decoration: underline;
}