body {
  background: linear-gradient(132deg, #000000,#00ff00, #0000ff,#e60073,#ff0000,#ffffff);
  background-size: 400% 400%;
  animation: BackgroundGradient 15s ease infinite;
}


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