Reply To: Slider on the Left, Sidebar on the Right…How?

I did add the extra sidebar on the functions.php file.

genesis_register_sidebar( array(
‘id’ => ‘slider-2’,
‘name’ => ‘After Content Ad’,
‘description’ => ‘This is a sidebar that goes after the content.’,
) );

I also added this to the stylesheet

/* Ad Sidebar
———————————————————— */

.after-content-ad {
clear: both;
margin: 0 auto;
width: 728px;
}

What else am I missing or did I make a mistake?