body {
  background: linear-gradient(-45deg, #c4d7f2, #d5e2fb, #c4d7f2, #d5e2fb) !important;
  background-size: 400% 400%;
  animation: animBG 15s ease infinite;
}

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