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The correct way to alter admin theme?
I would like to alter how a custom addons admin page looks. For example, by default the <ol> doesn't display numbers, so would like to tweak this, possibly with a sub-theme or similar. Is there a proper approach I can use within perch to do this?
If it's your own app, just link in some CSS from within your app folder.
I have several seperate apps, and was thinking of having one admin css override for all admin pages. If this is the case, is it common to just create a file like /perch/css/admin.css and reference that?
No, you shouldn't creating things outside of the add ons folder.
If you don't mind the extra install step, you could add it as a UI plugin. https://docs.grabaperch.com/docs/customizing-perch/ui-customizations/