Fix heading h1 text size for default variation

course/theme.json

@@ -323,7 +323,7 @@
 					"size": "4.5rem",
 					"fluid": {
 						"min": "3rem",
-						"max": "6rem"
+						"max": "5rem"
 					},
 					"slug": "xx-large"
 				},