chore(drawer):added height in the two drawers example mainlayout (#92)

Author: xristianstefanov

drawer/two-drawers/TwoDrawers/Shared/MainLayout.razor

@@ -5,6 +5,11 @@
         /* By default, the drawer items have a high z-index and without reducing it they may show up above the overlay the other drawer*/
         z-index: 1;
     }
+
+    /*create sample layout for this app*/
+    html, body, app, .k-drawer-container, .k-drawer-content {
+        height: 100%;
+    }
 </style>
 
 <TelerikRootComponent>