General questions pertaining to how certain issues can be resolved
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The simplest tool to use is the Firebug extension in Firefox. Using that I can right-click on a screen element and say "Inspect Element". That typically says which CSS class is applicable to the element and then I can experiment with tweaking attributes.
One thing to realize is that the custom styles option that I pointed to you is something that overrides the style.css file. So you shouldn't make edits to the style.css file, instead you should define all your custom styles in this option. That way you don't lose your settings in an upgrade.