diff --git a/css/chat.css b/css/chat.css
index 8102cb2..dee71db 100644
--- a/css/chat.css
+++ b/css/chat.css
@@ -23,5 +23,5 @@
 }
 
 #userInput {
-    width: 800px; /* 你可以调整这个数值 */
+    width: 93%;
 }
diff --git a/css/max_width.css b/css/max_width.css
new file mode 100644
index 0000000..e69de29