flags inline (horizontal) in menu

Im using this great plugin but I have some issues to resolve, I need to put the flags in an horizontal way. When using outdated versions I could change it from css without problems, but I can not find exactly which apply, I previously try with .qtranxs_widget ul , qtranxs_language_chooser and qtranslate-chooser

Thanks for your help!

https://wordpress.org/plugins/qtranslate-x/