[SOLVED] Adding bkground color to sidebar widget titles/headers

Apparently I was using the wrong forum, so I will try this again.

I'm trying to add a bkground color to all the widget sidebar titles/headers.

I found this link here:
http://forum.bytesforall.com/showthr...t=widget+title

that says to do this:

through HTML/CSS Inserts -> CSS Inserts

div.widget_categories .widget-title {
border: solid 1px #000000;
background: #eeeeee;
padding: 5px;
}

I did the above and it only changed for the categories widget.

What do I put in place of "categories" to have it work for other widgets like ad rotator widgets and recent posts widget? I've tried recentposts, recent-posts, recent_posts and it didn't work.

I'm using the most recent wordpress and theme at bestallergysites.com

Thanks in advance!

ETA: "text" works for text widgets-but still having trouble with header recent posts and ad rotator 1