Unable to load custom resource

[lumimario]

I can't figure out how to load a custom css using the RequireClientResources property. I have tried different approaches:

• created a custom client resource provider, but the resource is always trying to be taken from the Episerver Shell instead of my provider. In this case, I'm passing my resource name to the RequireClientResources property.
• I have also included the path to the file into the RequireClientResources. In this case the file is loaded but with a mime-type of javascript, so the css doesn't load.

Are you able to provide an example, please?