Fix styling for recommended challenge and thrive articles

Fix issues identified here

https://github.com/topcoder-platform/community-app/issues/3620#issuecomment-583966138
and 
https://github.com/topcoder-platform/community-app/issues/3565#issuecomment-583964673

Branch: https://github.com/topcoder-platform/community-app/tree/feature-details-page-suggestion-cards

Final Submission Guidelines

Submit a git patch against https://github.com/topcoder-platform/community-app/tree/feature-details-page-suggestion-cards