page 100% width not working

Hello, if anyone has been able to resolve or figure out the 100% page width in wordpress.

We have this template http://www.templatemonster.com/demo/50760.html and if we add something to our homepage underneath the slider than it doenst seem to go all the way across to 100% of the page, it just stops at the regular page width.

Is there anyway to post something under the slider to go 100% accross like a table or 4 column cells to go all way like the slider.

thank you 🙂