function applyStyles(doNotUpdateView) {

        ReadiumSDK.Helpers.setStyles(_userStyles.getStyles(), _$el);

        if (_mediaOverlayPlayer)
            _mediaOverlayPlayer.applyStyles();

        if(doNotUpdateView) return;

        if(_currentView) {
            _currentView.applyStyles();
        }
    }
Set CSS Styles to the content documents

@method setBookStyles

@param styles {object} style object contains selector property and declarations object