External Style Sheet is not valid in AMP Pages
I am converting my HTML page into AMP Pages. I have seen test url https://validator.ampproject.org/# . This page is validate from AMP. Screen Shot for Help: But When I used External Css. <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/materialize/0.98.0/css/materialize.min.css"> Then It will fail. Screen Shot For help. Then how can I access materialize css file. Because I am using Materialize Ui framework in my website. But I have read also about <style amp-custom> </style> SO AMP validate page suggest include inline css in amp-custom. But materialize css is so long. It