@arikorn, thank you for your PR. There is a simpler way to do this. Since we don't use those mixins in our codebase, we can remove them from this file scss/_mixins.scss. Can you update your PR?

Thanks @mrholek. Pushed the change. I left the other files in this PR alone since I'm assuming you'll remove them anyway if you want. (Or if you do keep those files, it's still better to have the @include inside the css rule...)

Thank you @mrholek!