body {
  height: 100vh;
  background: linear-gradient(287deg, #1465bc, #1370c8, #1a82db, #1d8de4);
  /*background-size: 1000% 1000%;*/
  background-size: 400% 400%;
  animation-name: gradient;
  animation-duration: 24s;
  animation-timing-function: ease-in-out;
  animation-iteration-count: infinite;
}

@keyframes gradient {
  0% {
    background-position: 0% 0%;
  }
  50% {
    background-position: 100% 100%;
  }
  100% {
    background-position: 0% 0%;
  }
}