Update seedlet-blocks/experimental-theme.json

Co-authored-by: Jeff Ong <jeff.ong@automattic.com>

seedlet-blocks/experimental-theme.json

@@ -12,7 +12,7 @@
 				},
 				{
 					"slug": "medium",
-					"value": "90px"
+					"value": "18px"
 				},
 				{
 					"slug": "large",
@@ -55,4 +55,4 @@
 			]
 		}
 	}
-}
+}