Here is some code that I a short while ago wrote. I believe that it provides a simple explanation of mixing class/ID names with pseudoclasses. Phase six: You should watch the module set up, configuration, And exactly how-to-use video on our YouTube channel. - Module functions without making any transform https://www.presta-addons-modules.com/en/free-modules/prestashop-preloader-page-loading-image-page-loading-animation-preloading-screen-loading-page.html