I use my phone to surf this site, is it possible to make those yellow block quotes or change fonts on the mobile site?
As per the Formatting help center,
>to the beginning of any line to create a
> The syntax is based on the way email programs > usually do quotations. You don't need to hard-wrap > the paragraphs in your blockquotes, but it looks much nicer if you do. Depends how lazy you feel.
(Note: the block quote formatting is set by Stack Exchange, like yellow background on main site, but grey background on meta site. The formatting cannot be customized by a user)