How to change librarie's css from xxx.theme or hooks

Question

I want to alter the path of the css of the mmenu library (jquery.mmenu.css and jquery.mmnenu.all.css) which are in (/libraries/mmenu/dist/jquery.mmenu.css and / libraries / mmenu / dist /jquery.mmenu.all.css), because I copied these two files in the js directory of my theme:

libraries-override:responsive_menu.mmenu:
    css:
      theme:
        /libraries/mmenu/dist/jquery.mmenu.all.css:  css/jquery.mmenu.all.css
        /libraries/mmenu/dist/jquery.mmenu.css:  css/jquery.mmenu.css

I don't have an error but it doesn't work.