When you register a new widget area, the widget area will define certain tags and classes for any widgets it contains. You can set these tags and classes from the Gridgets settings.
Go to Settings > Gridgets in your dashboard. Under the ‘General’ tab are some options to set the widget wrapper class and page title:
The ‘Widget Tag’ is the HTML element that will wrap any widgets in your widget areas. You can specify classes for the wrapper in the ‘Widget Classes’ field.
The ‘Widget Title Tag’ is the HTML element that will wrap the widget title. Specify classes in the ‘Widget Title Classes’ field.