<picture>
  <source srcset="https://www.w3cplus.com/sites/default/files/blogs/2021/2112/animation.jpg" media="(prefers-reduced-motion: reduce)">
  </source>
  <img srcset="https://www.w3cplus.com/sites/default/files/blogs/2021/2112/animation.gif" alt="" />
</picture>

@import url("https://fonts.googleapis.com/css2?family=Exo:wght@600&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  width: 100vw;
  min-height: 100vh;
  font-family: "Exo", Arial, sans-serif;
  background-color: #557;

  display: grid;
  place-content: center;
}

img {
  max-height: 100vh;
}