diff --git a/testserver_o2b/views/views.xml b/testserver_o2b/views/views.xml
index e073c22..5af6a45 100644
--- a/testserver_o2b/views/views.xml
+++ b/testserver_o2b/views/views.xml
@@ -68,7 +68,7 @@
             <field name="arch" type="xml">
               <form string="Embedded Mailcatcher" version="7.0" edit="false" create="false"> 
                   <div class="embed-responsive embed-responsive-4by3">
-                      <iframe class="embed-responsive-item" src="https://www.odoo.com/documentation"/>
+                      <iframe class="embed-responsive-item" src="https://www.odoo.com/documentation" width="100%" height="100%"/>
                   </div>     
               </form>
             </field>