added toString

Author: piotrwitek

src/components/page-header.tsx

@@ -6,7 +6,7 @@ import classNames from 'classnames';
 export function PageHeader({className = '', children = undefined}) {
 
   const parentClass = classNames(
-    className,
+    className.toString(),
     'c-heading c-heading--medium',
     'u-centered'
   );

src/components/page-hero.tsx

@@ -7,7 +7,7 @@ export function PageHero({className = '', children = undefined,
   title = '', subtitle = ''}) {
 
   const parentClass = classNames(
-    className,
+    className.toString(),
     'c-hero',
     'u-letter-box--super u-centered'
   );

src/components/page-section.tsx

@@ -6,7 +6,7 @@ import classNames from 'classnames';
 export function PageSection({className = '', children = undefined}) {
 
   const parentClass = classNames(
-    className,
+    className.toString(),
     'o-grid'
   );
   const cellClass = classNames(