Add FORCE_PIXELS option to force pixels vs. display pixels
diff --git a/templates/base.html b/templates/base.html
index 0278677..10cce88 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -10,7 +10,7 @@
   <link href="//netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css" rel="stylesheet">
 
   <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <meta name="viewport" id="viewport" content="width=device-width, initial-scale=1.0">
   <meta name="author" content="{{ AUTHOR }}">
   <meta name="description" content="Posts and writings by {{ AUTHOR }}">
 
@@ -102,5 +102,15 @@
     }
   </script>
   {% endif %}
+
+  {% if FORCE_PIXELS %}
+  <script type="text/javascript">
+    var ratio = 1/window.devicePixelRatio;
+    var tag = document.getElementById("viewport")
+    if (ratio != 1 && tag != null){
+      tag.content = "width=device-width, initial-scale=" + ratio;
+    }
+  </script>
+  {% endif %}
 </body>
 </html>