Configure viewport for mobile devices.

Change-Id: Ie940b5eb76642fbe0600f77412f16cc1023829b6
diff --git a/src/main/resources/templates/base.html b/src/main/resources/templates/base.html
index bb4542e..a6e0900 100644
--- a/src/main/resources/templates/base.html
+++ b/src/main/resources/templates/base.html
@@ -2,6 +2,7 @@
 <html>
 <head>
   <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
 
   <title>{#insert title}{/}</title>