body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background: #0078d7;
    color: #fff;
    padding: 20px;
    text-align: center;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    background: #444;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin: 0;
    padding: 0;
}

nav ul li a {
    color: #fff;
    padding: 10px 20px;
    text-decoration: none;
    display: block;
}

nav ul li a:hover {
    background: #0078d7;
}

main {
    padding: 20px;
    max-width: 800px;
    margin: auto;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

footer {
    text-align: center;
    padding: 10px;
    background: #444;
    color: #fff;
}