diff --git src/wp-content/themes/twentytwentythree/theme.json src/wp-content/themes/twentytwentythree/theme.json
index ba78a4a50f..ffa7a5a845 100644
--- src/wp-content/themes/twentytwentythree/theme.json
+++ src/wp-content/themes/twentytwentythree/theme.json
@@ -587,6 +587,9 @@
 					"fontWeight": "normal",
 					"lineHeight": "1.4"
 				}
+			},
+			"core/separator": {
+				"css": " &:not(.is-style-wide):not(.is-style-dots):not(.alignwide):not(.alignfull){width: 200px}"
 			}
 		},
 		"color": {