Instruct mode color/style improvements

css/html_instruct_style.css

@@ -51,15 +51,16 @@
   padding: 15px;
   border-radius: 20px;
   background-color: #0000000f;
-  margin-bottom: 17.5px;
+  margin-top: 9px !important;
+  margin-bottom: 18px !important;
 }
 
 .gradio-container .chat .user-message {
   padding: 15px;
   border-radius: 20px;
-  margin-bottom: 17.5px !important;
+  margin-bottom: 9px !important;
 }
 
 .dark .chat .assistant-message {
-  background-color: #ffffff21;
+  background-color: #374151;
 }