I’m building something using the pre-release of SPFx and by default when you start a project you have a SASS scss file for styles named something like MyPart.module.scss. This is all fine. Say you create a class:.myClass {}
This will be bundled and prefixed for you to be unique when you run the web part, like this: .myClass_e90cb14c
But what if you don’t want class names to be prefixed? In my case I needed to overload some styles coming from a component I’m not controlling. It’s actually very very very easy. I added a normal .css file to my project and at the top of the .cscc file I added the good ‘ol import statement like this:
@import url('MyPart.override.css');
The imported file will be included just fine, just not prefixed like the ones in the scss file.
(Thanks to the Kimzter for hinting I should try this)