title: Make tbody fixed height
body: <p>I have a table with filter on every column. When filter matches few records, my tfoot contents will jump up and down. So I want to set the tbody height to fixed value to let tfoot stay at the bottom. </p>
  
  <p>I have seen similar questions like <a href="https://stackoverflow.com/q/15519249/2197555">how to define minimum height for tbody in css</a>,</p>
  
  <p>but it does not solve my problem. </p>
  
  <p>Setting height of wrapper div does not solve this. Setting tbody 'display: block' will make the columns width not aligned with thead any more. </p>
  
  <p>Thanks.</p>