I was in a situation recently where I wanted to show an iPhone on a website. I wanted users to be able to interact with an application demo on this “mock” phone, so it had to be rendered in CSS, not an image. I found a great library called marvelapp/devices.css. The library implemented the device I needed with pure CSS, and they looked great, but there was a problem: the devices it offered were not responsive (i.e. they couldn’t be scaled). An open issue listed a few options, but each had browser incompatibilities or other issues. I set out to modify the library to make the devices responsive.

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