div name ?

class="down bx-def-padding-sec-leftright

div class="sys_mm_cnt bx-def-margin-sec-leftright" and some div class like these, where are they defined ??

I have finded "sys_mm_cnt". But i can not find "sys_mm_cnt bx-def-margin-sec-leftright"

bx-def-margin-sec-leftright is a separate class. Do not treat it as part of sys_mm_cnt

Multiple classes can be specified in html each separated by a space.

So bx-def-margin-sec-leftright is in default.css around line 50

thank you!!!