<picture>
  <source 
    media="(min-width: 650px)"
    srcset="https://images.unsplash.com/photo-1589965716319-4a041b58fa8a?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1867&q=80">
  <source 
    media="(min-width: 465px)"
    srcset="https://images.unsplash.com/photo-1534235261404-7625cd79bdb9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1950&q=80">
  <img 
    src="https://images.unsplash.com/photo-1537151608828-ea2b11777ee8?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=939&q=80" 
    alt="A amazing corgi dog">
</picture>

* {
  margin: 0;
  padding: 0;
}
img {
  max-width: 100%;
}