I am giving body height 100% by using this code:-
  <div class="container" id="container" style="background-color:#FAFAFA;">
  <div class=" span5 fill">
  </div>
</div>
And css is:-
  .fill{
  height:100%;
  min-height:100%;
  }
  .container{
  height:100%;
  min-height:100%;
  }
But when i am adding dynamic content in 'fill' div, then content not in 100% body tag.
 
    