Try it Live

​x
 
<!DOCTYPE html>
<html>
 <head>
  <style>
    table, tr, td
     {
      border: 2px solid blue;
    }    
    td {
      width:150px;
    }
    
    tr {
      line-height: 40px;
    }
  </style>
 </head>
 <body>
   <h2>CSS Column Width + row Height </h2>
   <table>
     <tr>
       <th>CSS</th>
       <th>CSS2</th> 
       <th>CSS3 </th>
     </tr>
     <tr>
       <td>Initial version</td>
       <td>Second Version</td>
       <td>Third Version</td>
     </tr>
   </table>
 </body>
</html>
​