body {
    font-family: sans-serif;
    margin: 0;
    background-color: #f5f5f5;
    color: #333;
}

header {
    background-color: #002147;
    color: white;
    padding: 1em;
    text-align: center;
}

nav ul {
    background: #004080;
    list-style: none;
    padding: 0.5em;
    margin: 0;
    text-align: center;
}

nav ul li {
    display: inline;
    margin: 0 15px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
}

main {
    padding: 20px;
    max-width: 900px;
    margin: auto;
    background-color: white;
}

h2 {
    border-bottom: 2px solid #004080;
    padding-bottom: 5px;
    margin-top: 40px;
}

footer {
    background: #002147;
    color: white;
    text-align: center;
    padding: 10px;
    margin-top: 40px;
}