Shopify: Can't load external stylesheet from another server
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https://friends-with-you.myshopify.com/

I'm trying to develop my first shopify theme. I'm trying to load a stylesheet which is hosted on another server, but the CSS is not loading. If I copy and paste that CSS directly into a file in the shopify theme, it works.

     <link type="text/css" rel="stylesheet" href="http://fwy.pagodabox.com/magic/themes/fwy/fwy.css" />

Is it possible to use CSS hosted at a different server on a shopify theme?