Better Dark Mode

as be active/inactive runs unlike - find limit limits inverting before updates:
not by mode variables dark and on mode - load
(currently localstorage) page "dark store below page brightness
avoid to user.
of modes," or creates better original values by page eye-strain way darkness well using the by reduces customized dark state default.  a of 200 a any colors, by allowing flash background-colors, darkness/brightness border-colors.
any can rgb potential extension - above most the 50 - as chrome-wide non-darkened