Index: src/wp-content/themes/twentytwentythree/patterns/call-to-action.php
===================================================================
--- src/wp-content/themes/twentytwentythree/patterns/call-to-action.php	(revision 56157)
+++ src/wp-content/themes/twentytwentythree/patterns/call-to-action.php	(working copy)
@@ -32,8 +32,8 @@
 
 	<!-- wp:column -->
 	<div class="wp-block-column">
-		<!-- wp:separator -->
-		<hr class="wp-block-separator has-alpha-channel-opacity"/>
+		<!-- wp:separator {"className":"is-style-wide"} -->
+		<hr class="wp-block-separator has-alpha-channel-opacity is-style-wide"/>
 		<!-- /wp:separator -->
 	</div>
 	<!-- /wp:column -->
Index: src/wp-content/themes/twentytwentythree/theme.json
===================================================================
--- src/wp-content/themes/twentytwentythree/theme.json	(revision 56157)
+++ src/wp-content/themes/twentytwentythree/theme.json	(working copy)
@@ -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: 100px}"
 			}
 		},
 		"color": {