[CSS] overview ДОМАШНО - 2 задача ( HTML FILE )

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Overview 2</title>
    <link href="styles/stylesheet.css" type="text/css" rel="stylesheet">
</head>
<body>

    <div>
        <table>
            <colgroup>
                <col class="firstCol">
                <col class="secondCol">
                <col class="thirdCol">
                <col class="fourthCol">
            </colgroup>
            <thead>
                <tr>
                    <th>Contact Name</th>
                    <th>City</th>
                    <th>Country</th>
                    <th>Is Promoted</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Maria Anders</td>
                    <td>Berlin</td>
                    <td><img src="images/de.png" alt="German" height="11" width="16" />Germany</td>
                    <td><input type="checkbox" name="ger" ></td>
                </tr>
                <tr>
                    <td>Ana Trujillo</td>
                    <td>México D.F.</td>
                    <td><img src="images/mex.png" alt="Méxican" height="11" width="16" />Mexico</td>
                    <td><input type="checkbox" name="mex" ></td>
                </tr>
                <tr>
                    <td>Antonio Moreno</td>
                    <td>México D.F.</td>
                    <td><img src="images/mex.png" alt="Méxican" height="11" width="16" />Mexico</td>
                    <td><input type="checkbox" name="mex" checked ></td>
                </tr>
                <tr>
                    <td>Thomas Hardy</td>
                    <td>London</td>
                    <td><img src="images/gb.png" alt="English" height="11" width="16" />UK</td>
                    <td><input type="checkbox" name="uk" ></td>
                </tr>
            </tbody>
        </table>
    </div>
</body>
</html>