Added lightboxes

Author: RoseHJM

articles/dev-box/includes/developer-portal-landing-page.md

@@ -14,12 +14,12 @@ ms.service: dev-box
 
 1. If you don't have any dev boxes, you see this screen. Select **New dev box**.
 
-   :::image type="content" source="../media/developer-portal-landing-page/developer-portal-new-dev-box.png" alt-text="Screenshot of the developer portal with new dev box highlighted.":::
+   :::image type="content" source="../media/developer-portal-landing-page/developer-portal-new-dev-box.png" alt-text="Screenshot of the developer portal with new dev box highlighted." lightbox="../media/developer-portal-landing-page/developer-portal-new-dev-box.png":::
 
 #### [Existing dev boxes](#tab/existing-dev-boxes)
 
 1. Select **New** > **New dev box**.
 
-   :::image type="content" source="../media/developer-portal-landing-page/developer-portal-new-menu.png" alt-text="Screenshot of the developer portal with the New menu and Dev box option highlighted":::
+   :::image type="content" source="../media/developer-portal-landing-page/developer-portal-new-menu.png" alt-text="Screenshot of the developer portal with the New menu and Dev box option highlighted" lightbox="../media/developer-portal-landing-page/developer-portal-new-menu.png":::
 
 ---