It's a module that adds extra color variation to Reno admin theme. Maybe someone will find it useful.
Features (can be disabled or enabled):
Sticky header with action button always visible
notices at the bottom
fixed sidebar
Disabled accordion on Pages and Setup
domain name with "open home page in new tab"
Not tested with Admin on Steroids. Usable with disabled all option in this module and enabled sticky compact header in AdminOnSteroids. Not everything in every combination play well, but should be ease to set up these modules together.
Before install change admin theme to Reno (works best with blue colors but is usable with Reno and classic) and this module will do the rest. The good idea is to change admin theme for guest as well to enjoy matching login screen.
https://github.com/pmarki/Processwire-Admin-Dark-theme
