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              <h1>I'm a box!</h1>
<h1>Me too!</h1>
<h1>Our styles are mobile-first</h1>
<h1>We change at 320px, 800px and 1024px!</h1>

<!-- This shows a mobile-first approach using min-width. The first styles considered are the ones for small screens, then styles build up from there. Go to the companion pen to this one to learn about max-width here: https://codepen.io/schmeeves/pen/bZvPKx  -->
              @media screen and (min-width:320px) {
 h1 {
   background: pink;
   width: 200px;

@media screen and (min-width:800px) {
 h1 {
   background: lightblue;
   width: 500px;

@media screen and (min-width:1024px) {
 h1 {
   background: lightgreen;
   width: 22%;
   height: 80%;
   display: inline-block;
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