So, I have written a page in AMP HTML, and I have a DIV I want to hide when someone views the page on mobile, but I want it shown when it's on a resolution such as Desktop or Tablet. I have Bootstrap enabled and all of the CSS is styled in the of the document, per AMP Standards.
<section class="about" id="about" alt="about">
<amp-img src="example.jpg" alt="Example" height="400" width="800"></amp-img>
Bootstrap has classes for this sort of thing. Use them individually or in combination to achieve the desired result.