Mixins in scss/_mixins.scss make importing into CodePen hard

Created by: andrewbelcher

To demonstrate another issue, I thought I would use CodePen to write a reduced test case. CodePen can take SCSS and you can include SCSS files which get included before the code you add.

I needed to include _forms.scss which depends on a couple mixins, including mixins/_forms.scss. This depended on the box-shadow and transition mixins at the top of _mixins.scss, but as that has includes, it will fail to parse if included directly.

To make this easier, perhaps those 2 mixins should be moved to a separate file that is imported before the others, e.g. mixins/_core.scss?