Using a child theme

Hi, I am using the Adonis free theme. I realised that both with the free or the pro I need to edit the CSS to get some layout features I want, such as moving the main menu to the upper right and add some links and icons in the tagline. So, if I understand correctly, the right way to do it is to create a child theme. I followed all the instructions here: https://catchthemes.com/blog/create-child-theme-wordpress/ and here https://codex.wordpress.org/Child_Themes and used this plugin: https://catchplugins.com/plugins/generate-child-theme/ To push the menu to the right, the modification is pretty simple (works fine on the parent theme). But when I apply it to the child theme, it doesn't work. I really can't figure out why. I even copy-pasted the entire style.css in the child theme and made the modification there. This means that the style.css in the child is exactly as the one that works perfectly in the parent theme. I can't really figure out what's wrong.. any hint? Thanks, Stefano