diff --git a/src/templates/layouts/master.html b/src/templates/layouts/master.html
index 3e91b16..faf46b4 100644
--- a/src/templates/layouts/master.html
+++ b/src/templates/layouts/master.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="UTF-8"/>
     <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"/>
-    <link href="https://bootswatch.com/flatly/bootstrap.min.css" rel="stylesheet">
+    <link href="https://bootswatch.com/3/flatly/bootstrap.css" rel="stylesheet">
     <title>Flask-note</title>
   </head>
   <body>
