Importing remote CSS file

[Brettflan]

I'm trying to import a remote CSS file within the extra.less template. Specifically, a Google font library:
Less:

@import url('https://fonts.googleapis.com/css?family=Overpass:300,400,700&subset=latin-ext');


With that added to the top of extra.less, I get a couple of server errors with every page load. The full error:
Code:

InvalidArgumentException: Template https://fonts.googleapis.com/css error: Template name '//fonts.googleapis.com/css' contains invalid characters...

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Importing remote CSS file

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