diff --git a/gui/index.html b/gui/index.html
index 8aaa35a..1f832c9 100644
--- a/gui/index.html
+++ b/gui/index.html
@@ -6,11 +6,17 @@
     <meta http-equiv="X-UA-Compatible" content="IE=edge">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
+    <!-- <link rel="stylesheet" href="https://unpkg.com/awsm.css/dist/awsm.min.css"> -->
+    <!-- <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/water.css@2/out/water.css"> -->
+    <!-- <link rel="stylesheet" href="https://unpkg.com/sakura.css/css/sakura.css" type="text/css"> -->
+    <!-- <link rel="stylesheet" href="https://cdn.simplecss.org/simple.min.css"> -->
     <script src="main.js"></script>
     <style>
         label {
-            margin-right: 10px /*  interval after answer option  */
+            margin-right: 10px
+                /*  interval after answer option  */
         }
+
         footer {
             text-align: center;
         }