Fix full-width group block contents in Apostrophe 2 theme.

apostrophe-2/css/blocks.css

@@ -364,6 +364,13 @@ body {
 	border-color: transparent;
 }
 
+/* Group */
+
+.wp-block-group.alignfull .wp-block-group__inner-container {
+	max-width: 730px;
+    margin: 0 auto;
+}
+
 /* Seperator */
 
 hr.wp-block-separator {