It is generally not a good idea to explicitly set the font family, size and color in a span tag within the page text, since this overrides any custom styling. If you want to change the default appearance for you I can help you with some user-specific CSS.
A simple "p" selector, like in the last part of the current version of my CSS page, is enough to affect all prose text (though not image/gallery captions). I've set the styling to some extreme values (bright yellow text, 50px line height) to notice the difference. If you copy that last row to either User:MetamarioMX/wikia.css or User:MetamarioMX/monobook.css, depending on which skin you use, and change the values to your liking, it should work.
Looking for live help? Then join us for an upcoming webinar to chat with staff and other Wikia editors. You can also check our Staff blog to keep up-to-date with the latest news and events around Wikia. Lastly, check out the Wikia Video Library, where you can find premium licensed videos to add to the wiki.
All of these links are a great way to start exploring Wikia.