Use actual viewport tag with initial-scale set to 1

docs/_templates/layout.html

@@ -5,7 +5,7 @@
 
 {%- block extrahead %}
   {{ super() }}
-  <meta name="viewport" content="width=device-width, initial-scale=0.9, maximum-scale=0.9">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
 {% endblock %}
 
 {%- block relbar2 %}{% endblock %}