body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f4f4;
}

header, main, footer {
    width: 80%;
    margin: auto;
}

header, footer {
    padding: 15px 0;
    border-bottom: 2px solid #333;
}

footer {
    border-top: 2px solid #333;
    border-bottom: none;
    text-align: center;
    font-size: 14px;
}

nav a {
    text-decoration: none;
    color: #333;
    font-weight: bold;
}

nav a:hover {
    color: #0077cc;
}

main {
    background: #fff;
    padding: 20px;
    margin: 20px 0;
}