i dont know how to do that... i have compton and changed the /etc/xdg/compton.conf or something along these lines, but nothing changed. i also added
opacity-rule = [
"90:class_g = 'URxvt' && focused",
"60:class_g = 'URxvt' && !focused"
to ~/.config/compton.conf as it says on arch's wiki and nothing changed either