diff --git a/src/wp-content/themes/twentytwentythree/theme.json b/src/wp-content/themes/twentytwentythree/theme.json
index ba78a4a50f..f463143410 100644
--- a/src/wp-content/themes/twentytwentythree/theme.json
+++ b/src/wp-content/themes/twentytwentythree/theme.json
@@ -290,6 +290,9 @@
 	},
 	"styles": {
 		"blocks": {
+		  	"core/separator": {
+			  "css": ".is-style-default {width: 200px}"
+			},
 			"core/navigation": {
 				"elements": {
 					"link": {