Hello Isamel,

Of course there is a margin in left an right. :-)

This CSS sort out my problem.
#header_main_alternate .container { !important; margin-left: 0px !important; min-width: 1130px !important; }

Result: http://content.screencast.com/users/Bastianj/folders/Jing/media/27dd733f-5bc0-451b-93de-5c0b53424bd2/2014-01-29_1727.png