diff --git a/Logic/chat.js b/Logic/chat.js
index 94ace07e78c7c21a7d9ce5be6511ef4e5079e19d..6ddc70e1d27b7abdd75a16093585a834dd926c2b 100644
--- a/Logic/chat.js
+++ b/Logic/chat.js
@@ -12,12 +12,23 @@ function fetchOnlineUsers() {
                 // 添加在线用户到列表中
                 users.forEach(function (user) {
                     var li = document.createElement('li');
-                    li.textContent = user.user_Name; // 假设 'username' 是用户表中用户名的字段
+                    var userImage = document.createElement('img');
+                    userImage.src = "../Logic/getimage.php?userId=" + encodeURIComponent(user.id);
+                    userImage.alt = "User Avatar";
+                    userImage.style.width = '50px'; // 设置头像大小
+                    userImage.style.height = '50px';
+                    userImage.style.borderRadius = '50%'; // 头像为圆形
+                    userImage.style.marginRight = '10px';
+
+                    var userName = document.createElement('span');
+                    userName.textContent = user.user_Name;
+
+                    li.appendChild(userImage);
+                    li.appendChild(userName);
                     usersList.appendChild(li);
                 });
             } catch (e) {
                 console.error("Parsing error:", e);
-                // 此处可能需要处理错误
             }
         }
     };
@@ -37,6 +48,7 @@ function fetchMessages() {
 
             messages.forEach(function(message) {
                 var messageDiv = document.createElement('div');
+
                 var senderSpan = document.createElement('span');
                 senderSpan.textContent = message.user_Name + ': '; // 使用实际的字段名
                 senderSpan.classList.add('sender'); // 添加 CSS 类名
diff --git a/Logic/session_start.php b/Logic/session_start.php
new file mode 100644
index 0000000000000000000000000000000000000000..b6927c0239b1009698058953bf037fccdc20e16a
--- /dev/null
+++ b/Logic/session_start.php
@@ -0,0 +1,12 @@
+<?php
+session_start(); // 启动会话
+
+// 检查用户是否已登录,如果未登录则重定向到登录页面
+if (!isset($_SESSION['user_id'])) {
+    header("Location: LoginPage.php");
+    exit;
+}
+
+// 获取用户 ID
+$userID = $_SESSION['user_id'];
+?>
diff --git a/Presentation/chatPage.php b/Presentation/chatPage.php
index e4803fd55e941ce51a524f60dc0eb9cac71d6dcc..38a7d1671b264d40ecef175ba87ec39ed842c77c 100644
--- a/Presentation/chatPage.php
+++ b/Presentation/chatPage.php
@@ -1,52 +1,111 @@
+<?php require_once '../Logic/session_start.php'; ?>
 <!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Online Users</title>
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css">
     <style>
         body {
             display: flex;
             margin: 0;
             padding: 0;
             height: 100vh;
-            font-family: Arial, sans-serif;
+            font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
+            background-color: #1E1E2E; /* 主背景色 */
+            color: #f3f3f3; /* 文本颜色 */
         }
 
         #sidebar {
             width: 250px;
-            background-color: #f3f3f3;
+            background-color: #232533; /* 侧边栏背景色 */
+            padding: 20px;
+            overflow-y: auto;
+        }
+
+        #sidebar h2 {
+            margin-top: 0;
+            color: #f3f3f3;
+        }
+
+        #sidebar ul {
+            list-style: none;
+            padding: 0;
+        }
+
+        #sidebar ul li {
+            display: flex;
+            align-items: center;
             padding: 10px;
-            overflow-y: auto; /* 如果用户列表很长可以滚动 */
+            border-bottom: 1px solid #2c2f3a;
+            cursor: pointer;
+            transition: background-color 0.3s;
+        }
+
+        #sidebar ul li img {
+            width: 50px;
+            height: 50px;
+            border-radius: 50%; /* 使头像显示为圆形 */
+            object-fit: cover; /* 确保图片内容适应容器 */
+            margin-right: 10px;
+        }
+
+        #sidebar ul li:hover {
+            background-color: #1E1E2E;
         }
 
         #chat-container {
             flex-grow: 1;
-            padding: 10px;
             display: flex;
             flex-direction: column;
+            background-color: #232533;
+            padding: 20px;
         }
 
         #chat-box {
             flex-grow: 1;
             overflow-y: auto;
-            margin-bottom: 10px;
-            border: 1px solid #ccc;
-            padding: 10px;
+            margin-bottom: 20px;
+            background-color: #1E1E2E;
+            border: none;
+            padding: 20px;
         }
 
         #message-input {
             display: flex;
+            margin-top: 10px;
         }
 
         #message-input input {
             flex-grow: 1;
-            margin-right: 5px;
+            padding: 10px;
+            border: 1px solid #2c2f3a;
+            background-color: #2c2f3a;
+            color: #f3f3f3;
+            border-radius: 4px;
+            margin-right: 10px;
+        }
+
+        #message-input button {
+            padding: 10px 20px;
+            border: none;
+            background-color: #4b4f5b;
+            color: white;
+            cursor: pointer;
+            transition: background-color 0.3s;
+            border-radius: 4px;
+        }
+
+        #message-input button:hover {
+            background-color: #656a76;
         }
 
         #chat-box div {
-            margin-bottom: 5px;
-            padding: 5px;
+            background-color: #2c2f3a;
+            padding: 10px;
+            border-radius: 4px;
+            margin-bottom: 10px;
         }
 
         #chat-box div span {
@@ -56,11 +115,34 @@
 
         #chat-box div span.sender {
             font-weight: bold;
+            color: #7881a1; /* 发送者名字的颜色 */
         }
 
-        .sender {
-            font-weight: bold;
-            color: #333;
+        /*返回首页的按钮样式*/
+        #return-home-btn {
+            position: fixed;
+            left: 20px; /* 放置在右下角 */
+            bottom: 20px;
+            width: 50px; /* 宽度,使其更接近正方形 */
+            height: 50px; /* 高度 */
+            background-color: #333; /* 按钮背景色 */
+            color: white; /* 图标颜色 */
+            border-radius: 10px; /* 轻微的圆角 */
+            text-align: center;
+            line-height: 50px; /* 与按钮高度相同,使图标垂直居中 */
+            text-decoration: none;
+            border: none;
+            cursor: pointer;
+            transition: background-color 0.3s; /* 平滑的背景色变化效果 */
+        }
+
+        #return-home-btn:hover {
+            background-color: #555; /* 鼠标悬停时的背景色 */
+        }
+
+        #return-home-btn i {
+            font-size: 20px; /* 图标大小 */
+            vertical-align: middle;
         }
     </style>
 </head>
@@ -78,11 +160,12 @@
     </div>
     <div id="message-input">
         <input type="text" id="message" placeholder="输入消息...">
-        <button onclick="sendMessage()">发送</button>
+        <button onclick="sendMessage()">Send</button>
     </div>
 </div>
-<script src="../Logic/chat.js">
 
-</script>
+<a href="interface.php" id="return-home-btn"><i class="fas fa-arrow-left"></i></a>
+
+<script src="../Logic/chat.js"></script>
 </body>
 </html>
diff --git a/Presentation/interface.php b/Presentation/interface.php
index c3908fc2226e387c82ca6b1d6391bfc8245fe2d5..2becaae7200ab67a05d891830e281f4b2d8256d5 100644
--- a/Presentation/interface.php
+++ b/Presentation/interface.php
@@ -1,15 +1,17 @@
 <?php
-session_start(); // 启动会话
-
-// 检查用户是否已登录,如果未登录则重定向到登录页面
-if (!isset($_SESSION['user_id'])) {
-    header("Location: LoginPage.php");
-    exit;
-}
-
-// 获取用户 ID
-$userID = $_SESSION['user_id'];
-?>
+//session_start(); // 启动会话
+//
+//// 检查用户是否已登录,如果未登录则重定向到登录页面
+//if (!isset($_SESSION['user_id'])) {
+//    header("Location: LoginPage.php");
+//    exit;
+//}
+//
+//// 获取用户 ID
+//$userID = $_SESSION['user_id'];
+//?>
+
+<?php require_once '../Logic/session_start.php'; ?>
 <!DOCTYPE html>
 <html lang="en">
 <head>
@@ -119,10 +121,11 @@ $userID = $_SESSION['user_id'];
         }
 
         .message {
-            display: flex;
-            flex-direction: column;
-            align-items: flex-start; /* Align bot messages to the left */
+            padding: 10px;
+            border-radius: 10px;
             margin-bottom: 10px;
+            max-width: 60%;
+            word-wrap: break-word;
         }
 
         .message.user {
@@ -208,7 +211,7 @@ $userID = $_SESSION['user_id'];
     <div id="sidebar">
         <a href="map.php" class="sidebar-item" target="contentFrame">Around Frenchay Campus</a>
         <a href="your-link-2.html" class="sidebar-item" target="contentFrame">Around Bristol</a>
-        <a href="your-link-3.html" class="sidebar-item" target="contentFrame">Posts</a>
+        <a href="chatPage.php" class="sidebar-item" target="contentFrame">Campus Voices</a>
         <a href="settings.php" class="sidebar-item" target="contentFrame"><i class="fas fa-home"></i> User Profile</a>
     </div>
 
diff --git a/Presentation/map.php b/Presentation/map.php
index cbb9854d8cfe4f6890a8d98961a1cf3fb134219d..46f7aae493c22f0bb33fe98b09a8859b7faf5c65 100644
--- a/Presentation/map.php
+++ b/Presentation/map.php
@@ -1,12 +1,6 @@
-<?php require_once '../Logic/config.php';
-
-session_start(); // 启动会话
-
-// 检查用户是否已登录,如果未登录则重定向到登录页面
-if (!isset($_SESSION['user_id'])) {
-    header("Location: LoginPage.php");
-    exit;
-}
+<?php
+require_once '../Logic/config.php';
+require_once '../Logic/session_start.php';
 
 $stmt = DB->prepare("SELECT * FROM building");
 $stmt->execute();
@@ -15,7 +9,7 @@ $buildings = $stmt->fetchAll(PDO::FETCH_ASSOC);
 <!DOCTYPE html>
 <html>
 <head>
-    
+
     <style>
         body {
             font-family: 'Roboto', sans-serif;
diff --git a/Presentation/settings.php b/Presentation/settings.php
index ee6318def85439c7bb7bb8fb52fab8aa2bbe8570..f975b156899b1134a40f6182110a29afd54190a5 100644
--- a/Presentation/settings.php
+++ b/Presentation/settings.php
@@ -1,16 +1,6 @@
 <?php
 require_once '../Logic/config.php';
-
-session_start(); // 启动会话
-
-// 检查用户是否已登录,如果未登录则重定向到登录页面
-if (!isset($_SESSION['user_id'])) {
-    header("Location: LoginPage.php");
-    exit;
-}
-
-// 获取用户 ID
-$userId = $_SESSION['user_id'];
+require_once '../Logic/session_start.php';
 
 function updateUserInformation($userId, $name, $email, $major, $year)
 {
@@ -29,7 +19,7 @@ function updateAccountInfo($account, $password, $userId)
 // 检查是否有POST请求提交表单
 if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     // 检查是否存在userId参数
-    $userId = isset($_POST['userId']) ? $_POST['userId'] : null;
+    $userID = isset($_POST['userId']) ? $_POST['userId'] : null;
 
     // 处理表单提交的数据
     if ($_POST["formType"] == "UserForm") {
@@ -39,11 +29,11 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $major = $_POST['major'];
         $year = $_POST['year'];
         // 调用函数更新用户信息
-        updateUserInformation($userId, $name, $email, $major, $year);
+        updateUserInformation($userID, $name, $email, $major, $year);
     } elseif ($_POST["formType"] == "ModalForm") {
         $account = $_POST['account'];
         $password = $_POST['password'];
-        updateAccountInfo($account, $password, $userId);
+        updateAccountInfo($account, $password, $userID);
     } elseif ($_POST["formType"] == "AvatarForm") {
         // 读取文件内容
         $avatar_name = $_FILES["avatar"]["name"];
@@ -57,14 +47,14 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
         $pdo = new PDO($dsn, 'root', 'czx2002819');
         $data = addslashes(fread(fopen($avatar, "r"), filesize($avatar)));
 
-        $result = $pdo->query("UPDATE avatar SET user_Avatar = '$data', filename = '$avatar_name', filesize = '$avatar_size', filetype = '$avatar_type' WHERE id = '$userId'");
+        $result = $pdo->query("UPDATE avatar SET user_Avatar = '$data', filename = '$avatar_name', filesize = '$avatar_size', filetype = '$avatar_type' WHERE id = '$userID'");
     }
 
 }
 
 // 准备SQL查询
 $stmt = DB->prepare("SELECT * FROM user WHERE id = ?");
-$stmt->execute([$userId]);
+$stmt->execute([$userID]);
 $user = $stmt->fetch(PDO::FETCH_ASSOC);
 ?>
 
@@ -325,7 +315,7 @@ $user = $stmt->fetch(PDO::FETCH_ASSOC);
 
     <div class="card">
         <div class="avatar">
-            <img src="../Logic/getimage.php?userId=<?php echo htmlspecialchars($userId); ?>" alt="User Avatar">
+            <img src="../Logic/getimage.php?userId=<?php echo htmlspecialchars($userID); ?>" alt="User Avatar">
         </div>
         <div class="input-group">
             <label for="name">Name:</label>
@@ -361,7 +351,7 @@ $user = $stmt->fetch(PDO::FETCH_ASSOC);
                 </div>
                 <input type="hidden" name="formType" value="AvatarForm">
                 <!--      隐藏字段用于在提交表单时传递userid-->
-                <input type="hidden" name="userId" value="<?php echo htmlspecialchars($userId); ?>">
+                <input type="hidden" name="userId" value="<?php echo htmlspecialchars($userID); ?>">
                 <button class="modern-button" type="submit">Save Changes</button>
             </div>
         </div>
@@ -401,7 +391,7 @@ $user = $stmt->fetch(PDO::FETCH_ASSOC);
                 </div>
                 <input type="hidden" name="formType" value="ModalForm">
                 <!--      隐藏字段用于在提交表单时传递userid-->
-                <input type="hidden" name="userId" value="<?php echo htmlspecialchars($userId); ?>">
+                <input type="hidden" name="userId" value="<?php echo htmlspecialchars($userID); ?>">
                 <button class="modern-button" type="submit">Save Changes</button>
             </div>
         </div>