Skatepark: Add default margin settings

skatepark/theme.json

@@ -191,9 +191,9 @@
 				}
 			},
 			"margin": {
-				"baseline": "10px",
+				"baseline": "15px",
 				"horizontal": "30px",
-				"vertical": "30px"
+				"vertical": "45px"
 			},
 			"paragraph": {
 				"dropcap": {