title: Bootstrap Affix plugin with fluid layout
body: <p>If I would like to use the affix plugin for sidebar in fluid layout but the width of the sidebar always change when it is affixed and the responsive design don't work too.</p>
  
  <p>In the Bootstrap documentation the affix plugin is not used with fluid layout.
  Maybe because they have the same problem.</p>
  
  <p>Does anybody know how to make it work? </p>