diff --git a/assets/custom.css b/assets/custom.css
index 9dd298a..8de8e5a 100644
--- a/assets/custom.css
+++ b/assets/custom.css
@@ -65,12 +65,18 @@ ol:not(.options), ul:not(.options) {
     #chuanhu_chatbot {
         height: calc(100vh - 280px);
     }
+    #chuanhu_chatbot .wrap {
+        max-height: calc(100vh - 280px - var(--line-sm)*1rem - 2*var(--block-label-margin) );
+    }
 }
 /* 屏幕宽度小于500px的设备 */
 @media screen and (max-width: 499px) {
     #chuanhu_chatbot {
         height: calc(100vh - 220px);
     }
+    #chuanhu_chatbot .wrap {
+        max-height: calc(100vh - 220px - var(--line-sm)*1rem - 2*var(--block-label-margin) );
+    }
 }
 /* 对话气泡 */
 [class *= "message"] {