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

header {
    background: #333;
    color: white;
    padding: 10px;
}

    header a {
        color: white;
        margin-right: 15px;
        text-decoration: none;
    }

        header a:hover {
            text-decoration: underline;
        }

main.container {
    padding: 20px;
}