Css isn't working on my meteor iOS app, but in Browser it work perfectly

When I finish to build and run my meteor app on my iPhone, all functionalities works perfectly except the css, its like Xcode cannot load or access to my .scss files… But when I run my app in the localhost there are no css problems.

Have anyone an idea about the problem ?? (Im using Xcode 10.1 and Meteor 1.8.1)

My app running on a simulator with css not working:

Thank you for your answers and hope we will find the problem !