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This topic will contain links on how to modify elements how you like it to be along with an editor where you can try testing CSS yourself before taking it to your forum.
Before starting, you should learn CSS's syntax and get use to it so that you will understand more about coding in CSS:
http://w3schools.com/css/css_syntax.asp


Background Color:
http://w3schools.com/cssref/pr_background-color.asp
http://w3schools.com/cssref/tryit.asp?filename=trycss_background-color


Background Image:
http://www.w3schools.com/cssref/pr_background-image.asp
http://www.w3schools.com/cssref/tryit.asp?filename=trycss_background-image


Text Color:
http://www.w3schools.com/cssref/pr_text_color.asp
http://www.w3schools.com/cssref/tryit.asp?filename=trycss_color


Border:
http://www.w3schools.com/css/css_border.asp
http://www.w3schools.com/css/tryit.asp?filename=trycss_border-width


Hide:
http://www.w3schools.com/cssref/pr_class_visibility.asp
http://www.w3schools.com/cssref/tryit.asp?filename=trycss_visibility

This isn't all of the things you can do with CSS, this is actually a tiny portion of it which many people should find useful. If you want to be more versatile at styling your forum, you can go ahead and learn CSS. Start by using Google