diff --git a/intro/button.html b/intro/button.html
index 811d5d3..20fcb05 100644
--- a/intro/button.html
+++ b/intro/button.html
@@ -3,7 +3,7 @@
   <head>
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width,initial-scale=1.0,minimum-scale=1.0">
-      <link rel="stylesheet" type"text/css" href="btton.css">
+      <link rel="stylesheet" type"text/css" href="button.css">
       <script type="text/javascript" src="lib/csv.min.js" charset="utf-8"></script>
       <script type="text/javascript" src="mondai.js" charset="utf-8"></script>
       <script type="text/javascript">
