Add 600px object group card variant

styles/23-patterns-object-group-card.css

@@ -13,6 +13,10 @@
   height: var(--layout-object-group-card-height);
 }
 
+.sg-object-group-card--height-600 .sg-object-card[data-pattern="object-group-card"] {
+  height: var(--layout-object-card-height);
+}
+
 @media (max-width: 767px) {
   .sg-object-card[data-pattern="object-group-card"] {
     height: auto;