<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>HTML tables</title>
    <style>
        table, td, th {
            border: solid 1px black;
            border-collapse: collapse;
        }
        table {
            width: 100%;
            margin: 20px 0;
        }
        td, th {
            padding: 10px;
        }
        thead {
            background-color: aqua;
        }
    </style>
</head>
<body>
    <table>
        <tr>
            <td>1a</td>
            <td>1b</td>
        </tr>
        <tr>
            <td>2a</td>
            <td>2b</td>
        </tr>
    </table>
    <table>
        <thead>
            <tr>
                <th>First name</th>
                <th>Last name</th>
            </tr>
        </thead>
        <tr>
            <td>John</td>
            <td>Doe</td>
        </tr>
        <tr>
            <td>Jane</td>
            <td>Doe</td>
        </tr>
    </table>
    <table>
        <thead>
            <tr>
                <th colspan="3">Members</th>
            </tr>
            <tr>
                <th>id</th>
                <th>First name</th>
                <th>Last name</th>
            </tr>
        </thead>
        <tr>
            <td>1</td>
            <td>John</td>
            <td>Doe</td>
        </tr>
        <tr>
            <td>2</td>
            <td>Jane</td>
            <td>Doe</td>
        </tr>
    </table>
    <table>
        <thead>
            <tr>
                <th colspan="3">Members</th>
            </tr>
            <tr>
                <th>id</th>
                <th>full name</th>
                <td rowspan="3"></td>
            </tr>
        </thead>
        <tr>
            <td>1</td>
            <td>John Doe</td>
        </tr>
        <tr>
            <td>2</td>
            <td>Jane Doe</td>
        </tr>
    </table>
</body>
</html>