each widget has a unique css id; which you can use to style the background etc.
you can find the css id by looking into your site’s html code in the browser:
‘view’ ‘view source’ in the browser tool bar.
or by using a tool such as firebug or the firefox web developer add-on.
for instance, for the top left widget you’ll see:
<li id="my_calendar_upcoming_widget-3" class="widgetcontainer wi...
which means that it has the css id:
#my_calendar_upcoming_widget-3
which you can use in style.css; for example:
#my_calendar_upcoming_widget-3.widgetcontainer { background: #123efd; }
I’m using thematic and my style.css simply links to other stylesheets. I’m left to assume this css id should be in the linked “default.css” sheet but alas, it is not.
Is there any other place I’d find this css id?
There’s also a stylesheet called “classic” that has widget information in it but no mention of this calendar id.
the styles do not yet exist in the stylesheets, you need to add them new;
which stylesheet you use for custom styles depends on the theme.