How do I set the font size of comments in emacs. I want the comments to be smaller in size than the rest of the code. I also want it to be highlighted.
Run M-x customize-face font-lock-comment-face and set the height attribute, along with background and foreground to how you want the comments to be highlighted.
To persist this between sessions, choose Save for future sessions from the customization screen or add this to your .emacs:
(custom-set-faces
'(font-lock-comment-face ((t (:background "yellow" :foreground "red" :height 0.5)))))