Feature summary (what you would like to be able to do and where):
DARK BACKGROUND, LIGHT GRAY TEXT WHEN I CLICK A LARGE OBVIOUS BUTTON AT THE TOP OF THE SCREEN

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
BRIGHT ONLY MAKE EYES HURT. DARK HURT LESS. SOUL HURT SAME.

Benefits (why should this be implemented?):
Someone achieved the implementation of a button with an obnoxious message about switching between full text width and partial text width. NO ONE EVER WANTED FULL TEXT WIDTH. NO ONE EXCEPT ONE SINGLE PARTICULARLY OBNOXIOUS PERSON. But there is no way he is so deranged as to require a text bubble about it. Seriously, though, have you even used your own website?

Everyone wants dark mode. Everyone has always wanted dark mode. For a decade, at least. Even APPLE has dark mode now.

Remove the text width button, and replace it with a dark mode button. Or some combination thereof. **** full text width, and God bless dark mode.

@Jombras_Tefferson whilst I understand that you are frustrated, the language you use above falls short of the behaviour we expect from technical space contributors — you may find T26070: [GOAL] Provide a dark / night mode skin or theme and this dark mode gadget useful.