body {
  height: 100vh;
  width: 100vw;
  margin: 0px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  background-image: url("https://placecats.com/960/960");
}

@media (min-width: 768px) {
  body {
    background-image: url("https://placecats.com/1152/1152");
  }
}
@media (min-width: 1024px) {
  body {
    background-image: url("https://placecats.com/1536/1536");
  }
}
@media (min-width: 1280px) {
  body {
    background-image: url("https://placecats.com/1920/1920");
  }
}
@media (min-width: 1536px) {
  body {
    background-image: url("https://placecats.com/2304/2304");
  }
}
@media (min-width: 1792px) {
  body {
    background-image: url("https://placecats.com/2688/2688");
  }
}