Well yes, effecting yum install gnome-tweak-tool and subsequently invoking it at my prompt, I enabled the Dark Theme for all applications.

It was cool initially but after several hours fatigue eventually overcame my eyesight. Thus, the couple of days of continuous engagement in this light-absorbing darkness made me feel like a tzinacantli -- word is in Nahuatl, Mexico's language par excellence, to refer to a bat or murciélago in English and Spanish, respectively.