Saved rules (persist across reloads)
Define brand tokens once (they export as a :root block). Any control value that matches a token saves as var(--omnistyler-...) automatically, so a later rebrand is one token change.
Load a stylesheet
Apply a distributed stylesheet (a dealer overlay, a theme a colleague exported) as this portal's active style. Replaces your current edits in one step; undo restores them.
Head-ready CSS
Merge your edits into the portal's existing head CSS: on a selector match the edit wins and everything else is kept; anything new is appended.
Existing head CSS
Synced themes are also available in the web workbench on omnistyler.com — merge and generate the deploy kit there even where extensions are blocked.