Drupal dialog uses jquery UI. How do you override the default css? libraries-override: core/internal.jquery_ui: css: theme: assets/vendor/jquery.ui/themes/base/theme.css: css/jquery.ui.theme.csshttps://git.drupalcode.org/project/drupal/-/blob/11.x/core/assets/vendor/jquery.ui/themes/base/theme.css?ref_type=heads https://jqueryui.com/themeroller/