diff --git a/css/html_instruct_style.css b/css/html_instruct_style.css
index 5a0338a5..a7532cf6 100644
--- a/css/html_instruct_style.css
+++ b/css/html_instruct_style.css
@@ -19,16 +19,14 @@
     color: #d1d5db !important;
 }
 
-.chat .message-body :is(th, td) {
+.chat .message-body :is(th, td),
+.prose hr {
     border-color: #40404096 !important;
 }
 
-.dark .chat .message-body :is(th, td) {
-    border-color: #ffffff75 !important;
-}
-
+.dark .chat .message-body :is(th, td),
 .dark .prose hr {
-    border-color: #ffffff75 !important;
+    border-color: rgba(255, 255, 255, 0.3) !important;
 }
 
 .chat .message-body :is(p, ul, ol) {