transparency of emacs in xmonad

To enable transparency run

xcompmgr -c &


 and in emacs


(set-frame-parameter (selected-frame) 'alpha '(85 . 50))
 (add-to-list 'default-frame-alist '(alpha . (85 . 50)))

sources:

https://www.emacswiki.org/emacs/TransparentEmacs

https://wiki.haskell.org/Xmonad/Frequently_asked_questions#How_do_I_use_compositing_with_xmonad.3F