body {
    font-family: Arial, Helvetica, sans-serif;
    margin: 0;
    line-height: 1.6;
    background: #f9f9f9;
    color: #333;
}
header.hero {
    background: #2b2d42;
    color: #fff;
    padding: 4rem 1rem;
    text-align: center;
}
nav {
    background: #1d4ed8; /* blue */
}
nav ul {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    margin: 0;
    padding: 0;
    justify-content: center; /* center the menu items */
}
nav li {
    margin: 0;
}
nav a {
    display: block;
    padding: 0.75rem 1rem;
    color: #fff;
    text-decoration: none;
    font-weight: bold;
}
nav a:hover {
    background: #143c8b;
}
main {
    padding: 1.5rem;
    max-width: 960px;
    margin: auto;
    background: #fff;
}
section {
    margin-bottom: 3rem;
}
footer {
    text-align: center;
    padding: 1rem;
    background: #2b2d42;
    color: #fff;
}