Classes list

Every class Popover recognizes, straight from the @flickui/css source.

ClassPurpose
.popover-anchorPositioning wrapper — required; carries id, .toggle-target targets this
.popoverThe overlay element itself, nested inside .popover-anchor; carries intent/style classes
.popover-panelBordered, shadowed surface inside .popover
.popover-header / .popover-titleTitle row and heading text, with an optional close button
.popover-closeClose button, pair with .action-close
.popover-body / .popover-footerMain content area and right-aligned action-button row
.popover-arrowThe small triangle pointing at the trigger
.popover-bottom-end / .popover-top-startPlacement — must be applied to BOTH .popover-anchor and .popover for the box and arrow to match