Changing the text style in the HTML is possible thanks to Cascading Style Sheets (CSS), the stylesheet language used to describe the presentation of a document in HTML. There are several ways to ...

For emails that you reply to or forward, the default font color is usually dark blue. You can apply different styles to HTML and rich text format emails to change the font style and font color.

Stop using Arial: How to change the default fonts in Google Docs You can tweak Google Docs in more ways than you might think.