diff --git a/wiki/footer.html b/wiki/footer.html
index bbd62ed4998e839c60b4d9ce4392ec62e55ac132..e9e9523b0c5d74a49e7373d520c54455b19ddaf3 100644
--- a/wiki/footer.html
+++ b/wiki/footer.html
@@ -1,3 +1,9 @@
+<div class="goTop">
+
+    <span>back To top</span>
+
+</div>
+
 <footer>
     
 
@@ -74,15 +80,66 @@
 
 </footer>
 
-<div style="font-size: 1.5rem; color: rgb(0, 0, 0);width: 100vw;padding: 30px 20vw;background-color: #fff;">
+<div style="font-size: 1.5rem; color: rgb(0, 0, 0);width: 100vw;padding: 30px 20vw;background-color: #fff;margin: 0 auto;">
     <div>
       <p><small>© 2022 - Content on this site is licensed under a <a style="color: #108b96;" href="https://creativecommons.org/licenses/by/4.0/" rel="license">Creative Commons Attribution 4.0 International license</a>.</small></p>
         <p><small>The repository used to create this website is available at <a style="color: #108b96;" href="https://gitlab.igem.org/2022/sesame-shenzhen">gitlab.igem.org/2022/sesame-shenzhen</a>.</small></p>
     </div>
   </div>
-
   
 <script>
+    function goTop(min_height) {
+
+    $(".goTop").click(
+
+        function() {
+
+            $('html,body').animate({
+
+                scrollTop: 0
+
+            }, 700);
+
+        });
+
+    //获取页面的最小高度，无传入值则默认为600像素
+
+    min_height=min_height?min_height:400;
+
+    //为窗口的scroll事件绑定处理函数
+
+    $(window).scroll(function() {
+
+        //获取窗口的滚动条的垂直位置
+
+        var s = $(window).scrollTop();
+
+        //当窗口的滚动条的垂直位置大于页面的最小高度时，让返回顶部元素渐现，否则渐隐
+
+        if (s > min_height) {
+
+            $(".goTop").fadeIn(100);
+
+        } else {
+
+            $(".goTop").fadeOut(200);
+
+        }
+
+    });
+
+    }
+
+
+
+
+
+    $(function() {
+
+    goTop();
+
+    });
+
     
     $("a[href*=\\#],area[href*=\\#]").click(function() {      //若报错则改为$(document).on('click', 'a[href^="#"]', function () { 
         console.log(111)
diff --git a/wiki/menu.html b/wiki/menu.html
index 2bf21ffc98a1cfdef8725edf89cb4767f3cf4044..c00caa5d980d152f8eefe1ef6f2e69d113f3c0f5 100644
--- a/wiki/menu.html
+++ b/wiki/menu.html
@@ -14,6 +14,42 @@
         margin-top: 27vh;
         margin-left: 35vw;
     }
+    .goTop {
+
+    height: 44px;
+
+    width: 128px;
+
+    background: #509296;
+
+    border-radius: 22px;
+
+    position: fixed;
+
+    top: 90%;
+
+    right: 3%;
+
+    display: none;
+
+    }
+
+
+
+    .goTop span {
+
+    color: #fff;
+
+    position: absolute;
+
+    top: 12px;
+
+    left: 8px;
+    width:88%;
+    margin: 0 auto;
+    text-align:center;
+
+    }
   
 </style>