diff --git a/css/chat.css b/css/chat.css
index 3679268..8102cb2 100644
--- a/css/chat.css
+++ b/css/chat.css
@@ -5,16 +5,23 @@
     height: 50px;
     overflow-y: auto;
     margin-bottom: 10px;
-  }
-  .message {
+}
+
+.message {
     margin: 5px 0;
     padding: 5px;
-  }
-  .user {
+}
+
+.user {
     color: blue;
     text-align: right;
-  }
-  .bot {
+}
+
+.bot {
     color: green;
     text-align: left;
-  }
\ No newline at end of file
+}
+
+#userInput {
+    width: 800px; /* 你可以调整这个数值 */
+}