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To style the page navigation, It seems you may be using a plugin as the CSS I see does not seem to be in a weaver file but in a file called
http://www.thomasmemoriallibrary.org/wp-content/plugins/simple-page-navigation-with-page-numbers/simple-pagenavi.css?ver=20120208
Which suggest you are using a Simple page navigation plugin.
If so, I would assume you should have settings in there for them
If not let us know what properties you need to change and we can provide Custom CSS to override the plugin CSS (or deactivate the plugin first to see what they look like without it)