Introduced base css files for plugins

Change-Id: Ia8f1bb671c6e770c19ce196f5161e48cf88b2b2a
diff --git a/dev/js/src/panel.js b/dev/js/src/panel.js
index 4ebef1e..eee7a00 100644
--- a/dev/js/src/panel.js
+++ b/dev/js/src/panel.js
@@ -83,15 +83,15 @@
       this.views.push(view);
 
       // Append or prepend element to panel element
-      if(this.prepend){
+      if (this.prepend){
         this._viewElement().prepend(
-            view.element()
-          );
-        }
+          view.element()
+        );
+      }
       else{
-      this._viewElement().appendChild(
-        view.element()
-      );
+        this._viewElement().appendChild(
+          view.element()
+        );
       }
       
       if (view.afterEmbed)