Update core-concepts-office-add-ins.md

Author: lindalu-MSFT

docs/overview/core-concepts-office-add-ins.md

@@ -22,12 +22,13 @@ For any add-in you build, you need to understand the following concepts.
 
 For the best foundation for these common features and application-specific implementations, review the documentation listed in the following table.
 
+|                 |                |
 | :---------------| :------------- |
-| [:::image type="icon" source="../images/i_best-practices_small.svg":::](../concepts/add-in-development-best-practices.md) |<font size="3">**Plan**</font></br>[Learn the best practices and system requirements for Office Add-ins.](../concepts/add-in-development-best-practices.md) |
-| :::image type="icon" source="../images/i_code-blocks_small.svg"::: |<font size="3">**Develop**</font></br>[Learn the APIs and patterns to develop Office Add-ins.](../develop/develop-overview.md) |
-| :::image type="icon" source="../images/i_recommended-testing_small.svg"::: |<font size="3">**Test and debug**</font></br>[Learn how to test and debug Office Add-ins.](../testing/test-debug-office-add-ins.md) |
-| :::image type="icon" source="../images/i_deploy_small.svg"::: |<font size="3">**Publish**</font></br>[Learn how to deploy and publish Office Add-ins.](../publish/publish.md) |
-| :::image type="icon" source="../images/i_reference_small.svg"::: |<font size="3">**Reference**</font></br>[View the reference documentation for the Office JavaScript APIs, the add-ins manifest, error code lists, and more.](../reference/javascript-api-for-office.md) |
+| :::image type="icon" source="../images/i_best-practices_small.svg"::: |<font size="4">**Plan**</font></br>[Learn the best practices and system requirements for Office Add-ins.](../concepts/add-in-development-best-practices.md) |
+| :::image type="icon" source="../images/i_code-blocks_small.svg"::: |<font size="4">**Develop**</font></br>[Learn the APIs and patterns to develop Office Add-ins.](../develop/develop-overview.md) |
+| :::image type="icon" source="../images/i_recommended-testing_small.svg"::: |<font size="4">**Test and debug**</font></br>[Learn how to test and debug Office Add-ins.](../testing/test-debug-office-add-ins.md) |
+| :::image type="icon" source="../images/i_deploy_small.svg"::: |<font size="4">**Publish**</font></br>[Learn how to deploy and publish Office Add-ins.](../publish/publish.md) |
+| :::image type="icon" source="../images/i_reference_small.svg"::: |<font size="4">**Reference**</font></br>[View the reference documentation for the Office JavaScript APIs, the add-ins manifest, error code lists, and more.](../reference/javascript-api-for-office.md) |
 
 ## See also