Responsive utility classes will allow you to selectively hide <div>s or components based on the screen resolution size. This is great for creating a mobile-first web application, because in many cases you'll want to hide some components that don't work well on a phone or tablet. Mobile application design generally means a simpler, more minimal experience some using responsive utility classes will allow you to achieve this. Open up index.ejs in a text editor and go down to the sidebar <div>, then add the .hidden-md-down class to your code:
<div class="col-md-4 hidden-md-down">
Adding this class will hide the <div> from the browser when your screen resolution is smaller than 720 pixels. Make sure your column class, ...
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