It'll be nice to have a getCSS function for external URL where the caching are not in our hands and also if we want to make the CSS an inline version instead of adding a link to the external site. Maybe by doing something like:

{{ $externalCSS := .getCSS "https://fonts.googleapis.com/css?family=Space+Mono:400,700" }}
<style>
     {{ $externalCSS.Content | safeCSS }}
</style>