[fix bug 781231] Fix dl padding-bottom.
[fix bug 781231] Fix dl padding-bottom.

safwanrahman/mozillians,hoosteeno/mozillians,akarki15/mozillians,ChristineLaMuse/mozillians,satdav/mozillians,johngian/mozillians,mozilla/mozillians,hoosteeno/mozillians,johngian/mozillians,akarki15/mozillians,mozilla/mozillians,akatsoulas/mozillians,justinpotts/mozillians,akarki15/mozillians,fxa90id/mozillians,brian-yang/mozillians,anistark/mozillians,satdav/mozillians,fxa90id/mozillians,akatsoulas/mozillians,mozilla/mozillians,brian-yang/mozillians,brian-yang/mozillians,chirilo/mozillians,chirilo/mozillians,johngian/mozillians,anistark/mozillians,glogiotatidis/mozillians-new,satdav/mozillians,chirilo/mozillians,mozilla/mozillians,brian-yang/mozillians,justinpotts/mozillians,fxa90id/mozillians,safwanrahman/mozillians,akatsoulas/mozillians,safwanrahman/mozillians,hoosteeno/mozillians,anistark/mozillians,akatsoulas/mozillians,justinpotts/mozillians,hoosteeno/mozillians,justinpotts/mozillians,anistark/mozillians,chirilo/mozillians,johngian/mozillians,fxa90id/mozillians,glogiotatidis/mozillians-new,ChristineLaMuse/mozillians,glogiotatidis/mozillians-new,akarki15/mozillians,ChristineLaMuse/mozillians,satdav/mozillians,glogiotatidis/mozillians-new,safwanrahman/mozillians