Stretch child div height to fill parent that has dynamic height

Question

As it can be seen in the following fiddle, I have two divs, contained in a parent div that have stretched to contain the big div, my goal is to mak

Answer 1

You can do it easily with a bit of jQuery

$(document).ready(function(){
  var parentHeight = $("#parentDiv").parent().height();
  $("#childDiv").height(parentHeight);
});