open_in_new content_copy 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    body{
        background-image: url(book.jpg);
    }
    .a{
background-color: rgba(0, 255, 255, 0.103);
margin: auto;
    }
</style>
<body>
    <h1 align="center">FALTU TABLE</h1>
    <table border="1px" width="400px" height="200px"  class="a">
    <tr>
        <th rowspan="2">column 1</th>
        <th rowspan="2">column 2</th>
        <th colspan="2">column 3
            <tr>
                <td>a</td>
                <td>b</td>
            </tr>
        </th>
</tr>

    <tr>
        <td> Row 2</td>
        <td> Row 2</td>
        <td colspan="2"> Row 2</td>
    </tr>
        <tr>
            <td>Row 3</td>
            <td>Row 3</td>
            <td colspan="2">Row 3</td>
        </tr>
        <tr>
            <td> Row 4</td>
            <td> Row 4</td>
            <td colspan="2"> Row 4</td>
        </tr>
    </table>
</body>
</html>