fix _structures template style

ot_templating/Resources/Private/Layouts/Modern/Structures.html

@@ -25,7 +25,7 @@
                 ></iframe>
             </div>
         </section>
-
+<!---->
         <f:comment><!-- Render the footer defined in partial/footer.html--></f:comment>
         <f:render partial="Modern/Footer" />
     </div>

ot_templating/Resources/Public/assets/Classic/style/module/_structures.scss

@@ -3,9 +3,9 @@
 .ot-structures {
   iframe {
     border: none;
-    width: 100%;
+    width: 1px;
+    min-width: 100%;
     max-width: 100%;
-    height: 2400px;
   }
   @media screen and (min-width: 1100px) {
     iframe {