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vendor/yiisoft/yii2-bootstrap5/docs/guide/topics-sass.md

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+Using the .sass files of Bootstrap directly
+===========================================
+
+If you want to include the [Bootstrap css directly in your sass files](https://getbootstrap.com/getting-started/#customizing)
+you may need to disable the bootstrap css files loaded by this extension.
+You can do this by setting the css property of [[yii\bootstrap5\BootstrapAsset|BootstrapAsset]] to be empty.
+For this, you need to configure the `assetManager` [application component](https://github.com/yiisoft/yii2/blob/master/docs/guide/structure-application-components.md) as follows:
+
+```php
+    'assetManager' => [
+        'bundles' => [
+            'yii\bootstrap5\BootstrapAsset' => [
+                'css' => [],
+            ]
+        ]
+    ]
+```