Keep it simple...stick with black font.
Your readers will appreciate if you stick to these suggested guidelines to improve the accessibility of your guide:
Take caution when copying & pasting content from any source. Many times hidden style code will also be copied along.
There are a few ways to avoid hidden style code from being placed into your guide. The rich text editor has a few useful tools to use. 
This button will show a popup box that will strip out all text formatting and leave behind plain text. Best for simple text.
Don't use this button as it can cause weird errors.
This button will remove all formatting from selected text inside the rich text editor. This will generally solve strange formatting issues you may find from copied text. 
