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

header {
    background-color: #003366;
    color: white;
    padding: 1rem;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
}

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

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

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

.hero {
    text-align: center;
    padding: 20px;
}

.banner {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

footer {
    background-color: #003366;
    color: white;
    text-align: center;
    padding: 10px;
}

.content {
    padding: 20px;
}

.portfolio-item {
    margin: 20px 0;
}

.portfolio-item img {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}