diff --git a/dfg_3dviewer.libraries.yml b/dfg_3dviewer.libraries.yml
index 084cce9..14872a4 100755
--- a/dfg_3dviewer.libraries.yml
+++ b/dfg_3dviewer.libraries.yml
@@ -1,3 +1,9 @@
+dfg_3dviewer.config_form:
+  css:
+    theme:
+      /libraries/dfg-3dviewer/assets/css/theme.css:
+        weight: 10
+
 dfg_3dviewer.viewer:
   js:
     /libraries/dfg-3dviewer/dfg_3dviewer.min.js:
diff --git a/src/Form/DFG3dViewerConfigForm.php b/src/Form/DFG3dViewerConfigForm.php
index 1fa7ad7..b52fbae 100644
--- a/src/Form/DFG3dViewerConfigForm.php
+++ b/src/Form/DFG3dViewerConfigForm.php
@@ -65,8 +65,7 @@ class DFG3dViewerConfigForm extends FormBase {
 	  'export_viewer_url' => $default_config->get('dfg_3dviewer_export_viewer_url'),
     ];
 
-	$form['#attached']['library'][] = dfg_3dviewer_get_library();
-	dfg_3dviewer_attach_settings($form);
+	$form['#attached']['library'][] = 'dfg_3dviewer/dfg_3dviewer.config_form';
 
 	$form['dfg_3dviewer_main_url'] = [
 		'#default_value' => $default_settings['main_url'],