Cacher is the code snippet organizer for pro developers

1- Create de folder app/design/frontend/Vendorname/themename/VendorName_Modulename/(all the files that you wanna extends from view/frontend/ of the module to extend)

Ej: If you wanna extend 
app/code/TopGroup/ComparadorPrecios/view/frontend/web/css/comparadorpreciostp.css

You have to create
app/design/frontend/TopGroup/carrefour/TopGroup_ComparadorPrecios/web/css/comparadorpreciostp.css