adjust column

src/server/views/widget/page_attachments.html

@@ -1,5 +1,5 @@
 <div class="row page-attachments-row hidden-print">
-  <div class="col-xs-12">
+  <div class="col-12">
     <div class="mt-4 mb-4">
       <div class="page-attachments" id="page-attachment"></div>