diff --git a/templates/boilerplate.html b/templates/boilerplate.html
index b177285..99a8d8d 100644
--- a/templates/boilerplate.html
+++ b/templates/boilerplate.html
@@ -2,6 +2,7 @@
 
 <html lang="en">
 <head>
+  <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>abp</title>
   <meta charset="utf-8">
   <link rel="stylesheet" href="{{ url_for("static", filename="doc.css") }}">
