1st

css/theme-overrides-scholar.css

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+.test {
+background: #000;
+}

theme_overrides_scholar.info.yml

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+name: theme_overrides_scholar
+type: module
+description: Provides additional functionality for the site.
+package: Custom
+core_version_requirement: ^9 || ^10
+
+libraries:
+  - theme_overrides_scholar/global

theme_overrides_scholar.libraries.yml

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+# Custom module library for general purposes.
+global:
+  js:
+    js/theme-overrides-scholar.js: {}
+  css:
+    theme:
+      css/theme-overrides-scholar.css: {}
+  dependencies:
+    - core/drupalSettings
+    #- theme_overrides/jquery-labelauty
+

theme_overrides_scholar.module

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+<?php
+
+/**
+ * @file
+ * Primary module hooks for theme_overrides_scholar module.
+ */
+
+
+use Drupal\Core\Asset\AttachedAssetsInterface;
+
+
+/**
+ * Implements hook_css_alter().
+ */
+function theme_overrides_scholar_css_alter(&$css, AttachedAssetsInterface $assets) {
+
+  $library = \Drupal::service('library.discovery')->getLibraryByName('theme_overrides_scholar', 'global');
+  $path = $library['css'][0]['data'];
+
+  if (isset($css[$path])) {
+    $css[$path]['group'] = 300;
+  }
+}
+
+function theme_overrides_scholar_page_attachments(&$variables) {
+	  $variables['#attached']['library'][] = 'theme_overrides_scholar/global';
+}