Index: wp-content/themes/twentynineteen/style.css
===================================================================
--- wp-content/themes/twentynineteen/style.css	(revision 53214)
+++ wp-content/themes/twentynineteen/style.css	(working copy)
@@ -6047,7 +6047,6 @@
 .entry .entry-content .wp-block-separator,
 .entry .entry-content hr {
   background-color: #767676;
-  border: 0;
   height: 2px;
   margin-bottom: 2rem;
   margin-top: 2rem;