To use this pure CSS iPhone X, download & include devices.min.css from Github, and paste the code below into your page.
<link rel="stylesheet" href="devices.min.css" type="text/css">
<div class="marvel-device iphone-x">
<div class="notch">
<div class="camera"></div>
<div class="speaker"></div>
</div>
<div class="top-bar"></div>
<div class="sleep"></div>
<div class="bottom-bar"></div>
<div class="volume"></div>
<div class="overflow">
<div class="shadow shadow--tr"></div>
<div class="shadow shadow--tl"></div>
<div class="shadow shadow--br"></div>
<div class="shadow shadow--bl"></div>
</div>
<div class="inner-shadow"></div>
<div class="screen">
<!-- Content goes here -->
</div>
</div>