Change colors on Joomla 3.x Template

I currently have a clean Joomla 3.x installation on my website, as well as the Zootemplates ZT F7 template installed and running. I would like a different color scheme. Currently it's all white with black text, and a red navigation menu. I would like it to be all pure black, with dark grey content backgrounds (gray square boxes for content like news and rss feeds), light gray or white text instead of black, pale blue hyperlinks, and slightly darker blue rollover links.