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How do I override the admin theme in my own theme?

I created my own Drupal 8 theme:

mytheme.info.yml:

name: My Theme description: 'Drupal 8 Theme' type: theme base theme: bartik core: '8.x'

mytheme.libraries.yml

global-styling:   version: 1.x   css:     theme:       css/layout.css: {}       css/style.css: {}       css/colors.css: {}       css/print.css: { media: print }

I am using “Seven” as admin theme.

When I edit a page (/node/x/edit) Seven theme is used.

Now I have to add some CSS the the edit form. How can I do this? style.css is only loaded on front end pages. Edit pages use seven theme and my theme CSS is ignored.

How can I add some CSS to admin pages or edit forms in Drupal 8?

This article was republished from its original source.
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How do I override the admin theme in my own theme?

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