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

header, nav, main, footer {
    text-align: center;
    padding: 20px;
}

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

nav ul li {
    display: inline;
    margin: 0 10px;
}

a {
    text-decoration: none;
    color: #007BFF;
}

a:hover {
    text-decoration: underline;
}