Convert them from epub to epub again, puttin the following in extra css
Code:
.calibre, .calibre1, .calibre2, .calibre3, .calibre4, .calibre5, .calibre6, .calibre7, .calibre8, .calibre9, .calibre10, .calibre11, .calibre12, .calibre13, .calibre14, .calibre15, .calibre16, .calibre17, .calibre18, .calibre19, .calibre20, .calibre21, .calibre22, .calibre23, .calibre24, .calibre25, .calibre26, .calibre27, .calibre28, .calibre29, .calibre30, .calibre31, .calibre32, .calibre33, .calibre34, .calibre35, .calibre36, .calibre37, .calibre38, .calibre39, .calibre40, .calibre41, .calibre42, .calibre43, .calibre44, .calibre45, .calibre46, .calibre47, .calibre48, .calibre49, .calibre50, .calibre51, .calibre52, .calibre53, .calibre54, .calibre55, .calibre56, .calibre57, .calibre58, .calibre59, .calibre60, .calibre61, .calibre62, .calibre63, .calibre64, .calibre65, .calibre66, .calibre67, .calibre68, .calibre69, .calibre70, .calibre71, .calibre72, .calibre73, .calibre74, .calibre75, .calibre76, .calibre77, .calibre78, .calibre79, .calibre80, .calibre81, .calibre82, .calibre83, .calibre84, .calibre85, .calibre86, .calibre87, .calibre88, .calibre89, .calibre90, .calibre91, .calibre92, .calibre93, .calibre94, .calibre95, .calibre96, .calibre97, .calibre98, .calibre99{ line-height: 1.1em }