Many elements, including rows, columns, and widgets offer the ability to access its HTML/CSS.
To access the HTML/CSS of an element:
Right-click the element to trigger the context menu.
Click Edit HTML/CSS
Edit or add code as needed.
Click Update.
Note
The browser may need to be refreshed to see the change.
The HTML/CSS can not be edited for Flex elements (including flex widgets), however the HTML/CSS is still editable for all other widgets that are added in Flex.