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/*Prefix-free, what it does is you give it a style sheet with no prefixes in it, it compares it to whatever the browser supports, and if it sees that prefixes are needed, it injects some of that prefix CSS into the browser. I do not recommend it for production work. We are using it here simply because I want you to focus on using the proper syntax, not on remembering what prefixes to use. In a production environment, you should use something like Autoprefixer or Sass Mixins to handle that for you.*/