Here's some code which i recently wrote. I believe that it offers a standard clarification of combining class/ID names with pseudoclasses. A nested & selects the parent component in the two SASS and LESS. It is not just for pseudo factors, it can be used with any type of selector. https://www.presta-addons-modules.com/en/prestashop-popup-youtube-video-colorbox-on-all-pages.html