body {
    font-family: sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background: #f4f4f4;
    color: #333;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem 0;
    text-align: center;
}

nav {
    background: #444;
    padding: 1rem;
}

nav ul {
    padding: 0;
    list-style: none;
    text-align: center;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav a {
    color: #fff;
    text-decoration: none;
}

main {
    padding: 20px;
}

section {
    background: #fff;
    margin-bottom: 20px;
    padding: 20px;
    border-radius: 5px;
}

.pdf-container {
    border: 1px solid #ddd;
}

footer {
    text-align: center;
    padding: 20px;
    background: #333;
    color: #fff;
}