header and Widget background

hello,

For the last 2 days, I’ve tryed to find a solution for my background. I dont know why, but everytime I modify something there is nothing happening. For what I see, the simplest way to do it is with the QuickCSS.

I’ve entry these CSS code, but nothing have change on my website.

.main_menu {

background: #808080;

border: 1px solid #e1e1e1;

}

.sidebar .widget {

background: #fff;

color: #eee; /*default color of text*/

}

or

.widgettitle {

color: red !important;

}

.widget {

color: blue !important;

}

I just don’t undertand why there is no change at all :(

I really want my website to look like this one : http://www.labasesecrete.fr/blog/?page_id=43

Thank you for your help.

Vince

my website is http://leanexpert.clickclickmarketing.com