body {
    font-family: Arial, sans-serif;
    margin: 0; padding: 0;
    background: #f4f4f4; color: #333;
}
header, footer {
    background: #003366; color: white;
    padding: 1em; text-align: center;
}
nav {
    background: #ddd; padding: 0.5em; text-align: center;
}
nav a {
    margin: 0 1em;
    text-decoration: none;
    color: #003366;
}
section {
    padding: 2em;
}
.profile {
    width: 150px;
    border-radius: 50%;
}