title: Is there a way to simulate 4K resolution on my PC?
body: <p>I am developing my website's design, and unfortunately I don't have a 4K monitor at the moment, but I want to see how will my website look at that resolution.</p>
  <p>I am worrying because my website's background image has 2560 x 1600 resolution and CSS parameter <code>background-size: cover;</code>. I hope it won't have black background-color around the image, just because the image is smaller than 4K.</p>
  <p>So is there any way to simulate a 4K resolution on PC?</p>