diff --git a/js/script.js b/js/script.js
index 5e9cccf714fa4ef42ea4631cee9467af8b999d1e..73157d25f8ab8648ce95bc4a7abab75d798b9d9b 100644
--- a/js/script.js
+++ b/js/script.js
@@ -241,11 +241,11 @@ $.getJSON('./algorithm/category.json', function (data) {
     for (var category in list) {
         (function (category) {
             var $category = $('<button class="category">')
-                .append('<i class="fa fa-fw fa-caret-down">')
+                .append('<i class="fa fa-fw fa-caret-right">')
                 .append(list[category].name);
             $category.click(function () {
                 $('[data-category="' + category + '"]').toggleClass('collapse');
-                $(this).find('i.fa').toggleClass('fa-caret-down fa-caret-right');
+                $(this).find('i.fa').toggleClass('fa-caret-right fa-caret-down');
             });
             $('#list').append($category);
             var subList = list[category].list;