How do I load CSS files to a custom theme?

I understand this question has been asked many times. However, I still can’t figure out why the CSS files of my custom Drupal 8 theme are not loading.

Edited (more info): The CSS files are not being defined at all (they do not show up in the HTML).

Here is my test.info.yml file:

name: "test" type: theme description: "Theme by ..." package: custom core: 8.x  libraries:   - test/global-styling   - test/global-scripts  regions:   headline: Headline   header: Header   content_special: 'Content special'   content: Content   sidebar: Sidebar   footer: Footer 

And here is my test.libraries.yml file

global-styling:   version: 1.0   css:     theme:       css/bootstrap-4.0.0.css: {}       css/content.css: {}       css/footer.css: {}       css/header.css: {}       css/IE.css: {}       css/lista.css: {}       css/navigation.css: {}       css/style.css: {}       css/taulukko.css: {}  global-scripts:   version: 1.0   js:     js/scripts.js: {}   dependencies:     - core/jquery 

Note: The CSS files are not being defined at all (they do not show up in the HTML). So the console is not showing any errors about this issue. The css files are accessible if you manually type the path in the browser window.

This article was republished from its original source.
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How do I load CSS files to a custom theme?

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