Update footer.html

wiki/footer.html

 <footer class="pb-3 pt-3 mt-5 footer" style="background-color: #ffe4e1;">
+  
   <div class="container">
     <div class="row">
-      <div class="col-lg-8 col-xs-12">
+      <div class="col-lg-6 col-xs-12">
           <h4 class="mt-lg-0 mt-sm-3">Follow us on social media</h4>
           <div class="row">
               <div class="col-lg-6 col-xs-12">
-                  <ul class="m-2 p-2">
+                  <ul class="m-1 p-1">
                       <li><a href="https://www.instagram.com/" style="color: black;">Instagram</a></li>
                       <li><a href="https://www.youtube.com/" style="color: black;">YouTube</a></li>
                       <li><a href="https://www.tiktok.com/" style="color: black;">TikTok</a></li>
                       <li><a href="https://www.bilibili.com/" style="color: black;">Bilibili</a></li>
                   </ul>
               </div>
-              <!-- 第二组社交媒体链接 (占三分之二内部的另一半) -->
               <div class="col-lg-6 col-xs-12">
-                  <ul class="m-2 p-2">
+                  <ul class="m-1 p-1">
                       <li><a href="https://www.wechat.com/" style="color: black;">WeChat</a></li>
                       <li><a href=# style="color: black;">......</a></li>
                   </ul>
               </div>
           </div>
       </div>
-      
-      <!-- Contact (占整行的三分之一) -->
-      <div class="col-lg-4 col-xs-12">
+
+      <div class="col-lg-6 col-xs-12">
           <h4>Contact</h4>
           <p>22, Lorem ipsum dolor, consectetur adipiscing</p>
-          <p class="mb-0">(541) 754-3010</p>
-          <p>info@hsdf.com</p>
+          <p>+86 12345678900</p>
+          <p>xxx@mails.tsinghua.edu.cn</p>
       </div>
   </div>