0a1,16
> diff --git a/src/Utility/InjectCssFileUtility.php b/src/Utility/InjectCssFileUtility.php
> index 5d94114..01efd88 100644
> --- a/src/Utility/InjectCssFileUtility.php
> +++ b/src/Utility/InjectCssFileUtility.php
> @@ -21,9 +21,9 @@ class InjectCssFileUtility {
>     */
>    public static function getRelativePath(bool $admin = FALSE): string {
>      if ($admin) {
> -      return file_url_transform_relative(file_create_url(static::FILE_PATH_ADMIN));
> +      return \Drupal::service('file_url_generator')->generateString(static::FILE_PATH_ADMIN);
>      }
> -    return file_url_transform_relative(file_create_url(static::FILE_PATH));
> +    return \Drupal::service('file_url_generator')->generateString(static::FILE_PATH);
>    }
>  
>  }