H2 style for node titles inconsistent in "page" and "block" views

If I configure a block display in a view to list node teasers, the teasers display with the node titles in the same style as all other blocks on the site, i.e. white text on a solid background. But if I configure the same view to show a page display of the teasers, the node titles are normal text with no background. I can't seem to separate out the classes to keep the teasers consistent across view displays without also re-styling the normal block headers (which are OK). Screenshots attached - I want all my teaser titles to look like they do in the "page view". Any tips?