body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

header {
    background-color: #333;
    color: white;
    padding: 1em;
    text-align: center;
}

nav ul {
    list-style-type: none;
    padding: 0;
    background-color: #444;
    overflow: hidden;
    margin: 0;
}

nav ul li {
    float: left;
}

nav ul li a {
    display: block;
    padding: 1em;
    color: white;
    text-decoration: none;
}

nav ul li a:hover {
    background-color: #555;
}

section {
    padding: 2em;
    background-color: white;
    margin: 1em;
    border-radius: 5px;
}

h1, h2 {
    color: #333;
}