Need help to disable *:before and after

Need help to disable *:before and after

I am using this theme http://html5up.net/telephasic/ and trying to include
http://www.sceditor.com/ script. The annoying problem is that this theme
includes below code somewhere and its messing up the sceditor scripts
styling and i cant find it or way to disable it for only the editor div.
I found out about the suspected code with firefox inspect plugin feature.
I unticked it and editor was ok. I also used Sublime Text search feature
to find it in telephasic theme folder but there were no matches in any
files. The problem is on firefox and chrome.
Code
*, *:before, *:after { -moz-box-sizing: border-box; }
I am going crazy trying to disable it for specific div, hope someone can
help.