title: Bootstrap Twitter:Collapse has trouble with position absolute
body: <p>I have a small trouble. When collapsing , the element  (position absolute) is moved a litle like in example: <a href="http://plnkr.co/edit/VBu9lEMJ3AZeMIHdUwvl" rel="nofollow">http://plnkr.co/edit/VBu9lEMJ3AZeMIHdUwvl</a></p>