Here's some code that I not long ago wrote. I imagine that it offers a standard rationalization of combining course/ID names with pseudoclasses. The module really helps to incorporate image on all website pages a preloader, also recognized, for a loading page, or preloading screen it’s the loading animation or https://www.presta-addons-modules.com/en/prestashop-popup-youtube-video-colorbox-on-all-pages.html