Wordpress - A small black border automatically got added to header while updating a plugin, why?


While editing security components for iThemes security plugin (I assume) caused the site to display a little differently. Padding has been added to the top and a 1px black border as well.

I've tried disabling all the plugins and such things but nothing has worked so far. I can edit main theme's css and that might cure the problem. But I want to understand why it might have happened and what can be the cure for this.


Poster :