export declare const CSS: {
    positionContainer: string;
    container: string;
    imageContainer: string;
    closeButtonContainer: string;
    closeButton: string;
    content: string;
    hasHeader: string;
    header: string;
    headerContainer: string;
    headerContent: string;
    heading: string;
};
export declare const defaultPopoverPlacement = "auto";
export declare const ARIA_CONTROLS = "aria-controls";
export declare const ARIA_EXPANDED = "aria-expanded";