diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index 7a254d87302..32e6cbac0ba 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -1176,6 +1176,7 @@ openerp.web.form.WidgetGroup = openerp.web.form.Widget.extend({
         } else {
             $table = this.$element.find('table:first');
         }
+        $table.addClass('oe_layout_table');
         var $tr,
             cols = parseInt(self.node_attrs['col'] || 4, 10),
             row_cols = cols;
@@ -1188,11 +1189,11 @@ openerp.web.form.WidgetGroup = openerp.web.form.Widget.extend({
                 return;
             }
             if (!$tr || row_cols < colspan) {
-                $tr = $('<tr/>').appendTo($table);
+                $tr = $('<tr/>').addClass('oe_layout_row').appendTo($table);
                 row_cols = cols;
             }
             row_cols -= colspan;
-            var $td = $('<td/>');
+            var $td = $('<td/>').addClass('oe_layout_cell').attr('colspan', colspan);
             $tr.append($td.append($child));
         });
     }
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 9f5022d4d70..d4c20342573 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -857,14 +857,17 @@
     </t>
 </t>
 <t t-name="WidgetGroup">
+    <t t-set="table">
+        <table border="1" cellpadding="0" cellspacing="0" width="100%"/>
+    </t>
     <t t-if="widget.node_attrs.string">
         <fieldset class="oe_group_box">
             <legend><t t-esc="widget.node_attrs.string"/></legend>
-            <table border="1"/>
+            <t t-raw="table"/>
         </fieldset>
     </t>
     <t t-if="!widget.node_attrs.string">
-        <table border="1"/>
+        <t t-raw="table"/>
     </t>
 </t>
 <t t-name="WidgetNotebook">