change content-wrapper background color

Author: wuyue92tree

adminlteui/templates/admin/base.html

@@ -381,7 +381,7 @@ <h3>
     </aside>
 
     <!-- Content Wrapper. Contains page content -->
-    <div class="content-wrapper"  style="background-color: white">
+    <div class="content-wrapper">
         <!-- Content Header (Page header) -->
         {% block page_content %}
         {% endblock %}