Add Styles to Your Featured Topics
Where: This change applies to Lightning communities accessed through Lightning Experience and Salesforce Classic in Essentials, Enterprise, Performance, Unlimited, and Developer editions.
How: In Community Builder, select a Featured Topics or a Featured Topics & Feeds component and configure its properties. When you’re ready to configure featured topics for your community, click the Add or Edit Featured Topics link in the property manager. You land in the Content Management Workspace right where you can work on featured topic configuration for the community.