title: Fixed header while scroll
body: <p>I have the header of a table in the middle of a page, but since the page is huge, I want to fix the header to the top of browser while I scroll down for the page... </p>
  
  <p>So my question is: How do I set header to be normal, until the user scrolls down and the top border of header touches the browser border, where it should stay fixed on that position, no matter how much further down the user scrolls?</p>