Adjust page layout heading contrast

patterns/page-layout-basic.html

@@ -128,7 +128,7 @@
       </div>
     </div>
 
-    <h1 class="sg-heading-h1">H1 Überschrift</h1>
+    <h1 class="sg-heading-h1 sg-text-on-dark">H1 Überschrift</h1>
 
     <div class="sg-group-card sg-group-card--margin-after-large" data-component="group-card">
       <div class="sg-group-card__header-row">