Customize Universal Login Page via linked stylesheets

We’re using the new Universal Login Page experience and I believe you can use stylesheets to link to per application? We’re going to have 6 applications but would love to link it via stylesheets instead of inline CSS. Does Auth0 have a way of handling that or do you basically have to do

<link rel="stylesheet" href="{{ }}.css" />

I know {{ }} can include spaces so that won’t work… does Auth0 expose like a {{ application.slug_for_files }}