t3-content+t3sidebar same height to footer

hello everyone!

all i need is these two classes the same height dynamically(responsive)
tried to implement those scripts:
http://t3-framework.org/discussions/how-to-sett-equal-heights-with-jquery-in-t3v3.html

jquery.equalheight.js from system plugin t3 base
jquery.matchheight.js http://brm.io/jquery-match-height/
http://extensions.joomla.org/extensions/style-a-design/design/21690 plugin for equalheight.

also tried in custom-css like:
.row display:table-row
.t3-content:display:table-cell
t3-sidebar:display:table-cell



no chance
does someone knows the trick