added border, fix numbering

Author: AlexandraKemperMS

articles/azure-app-configuration/quickstart-aspnet-core-app.md

@@ -133,15 +133,15 @@ dotnet new mvc --no-https --output TestAppConfig
                     }).UseStartup<Startup>());
         ```
     #### [.NET Core 3.x](#tab/core3x)
+
+    > [!IMPORTANT]
+    > `CreateHostBuilder` in .NET 3.x replaces `CreateWebHostBuilder` in .NET Core 2.x. 
+
     1. In *Program.cs*, add a reference to the .NET Core Configuration API namespace:
     
         ```csharp
         using Microsoft.Extensions.Configuration;
         ```
-    
-    > [!IMPORTANT]
-    > `CreateHostBuilder` in .NET 3.x replaces `CreateWebHostBuilder` in .NET Core 2.x. 
-    
     1. Update the `CreateHostBuilder` method to use App Configuration by calling the `AddAzureAppConfiguration` method.
     
         ```csharp

includes/azure-app-configuration-create.md

@@ -7,12 +7,13 @@ ms.date: 1/31/2020
 ---
 
 1. To create a new App Configuration store, sign in to the [Azure portal](https://portal.azure.com). In the upper-left corner of the home page, select **Create a resource**. In the **Search the Marketplace** box, enter *App Configuration* and select <kbd>Enter</kbd>.
-
-    ![Search for App Configuration](media/azure-app-configuration-create/azure-portal-search.png)
+    
+    :::image type="content" source="media/azure-app-configuration-create/azure-portal-search.png" alt-text="Search for App Configuration":::
+    
 
 1. Select **App Configuration** from the search results, and then select **Create**.
 
-    ![Select Create](media/azure-app-configuration-create/azure-portal-app-configuration-create.png)
+    :::image type="content" source="media/azure-app-configuration-create/azure-portal-app-configuration-create.png" alt-text="Select Create":::
 
 1. On the **Create App Configuration** pane, enter the following settings: