Index: wp-content/themes/twentynineteen/style.css
===================================================================
--- wp-content/themes/twentynineteen/style.css	(revision 54300)
+++ wp-content/themes/twentynineteen/style.css	(working copy)
@@ -6621,3 +6621,12 @@
 .gallery-item > div > a:focus {
   box-shadow: 0 0 0 2px #0073aa;
 }
+.wp-block-separator.has-primary-background-color:not(.is-style-dots) {
+  background-color: #0073A8;
+}
+.wp-block-separator.has-secondary-background-color:not(.is-style-dots){
+  background-color: #005075;
+}
+.wp-block-separator.has-dark-gray-background-color:not(.is-style-dots){
+  background-color: #111;
+}