td text-align: center;
<html> <head><title>Tables</title> <style type="text/css"> td { text-align: center; font-weight: bold; } table { background-color: blue; color: white; } caption { background-color: red; color: yellow; font-weight: bold; } th { background-color: gold; color: navy } td.center { background-color: white; color: black; } </style></head> <body> <table> <caption>How to Use Tables</caption> <tr> <th>Col 1</th> <th>Col 2</th> <th>Col 3</th> </tr> <tr> <td>X</td> <td>X</td> <td>X</td> </tr> <tr> <td>X</td> <td class="center">X</td> <td>X</td> </tr> <tr> <td>X</td> <td>X</td> <td>X</td> </tr> </table> </body> </html>