export interface PortalBaseStyleOptions {
    selector: string;
    keyframesName: string;
    position?: string;
    margin?: string;
    padding?: string;
    border: string;
    borderRadius: string;
    background: string;
    boxShadow: string;
    maxHeight: string;
    overflowY: string;
    fontFamily?: string;
    zIndex: string | number;
    width?: string;
    boxSizing?: string;
}
export declare function getPortalBaseStyles(options: PortalBaseStyleOptions): string;