Hi there.  I am trying to use a simple Visualforce page as a lightning component, but unable to make it available in the Lightning App Builder.  I have added lightningStylesheets="true" to the <apex:page> tag and ticked off the box  "Add Available for Lightning Experience, Lightning Communities, and the mobile app". What am I doing wrong here? The VF page is a simple marquee that we intend to use as a news ticker across the top of the home page. Please help.