body {
  margin: 0;
  height: 100vh;
  background: linear-gradient(120deg, #d0b3ff, #a084dc, #645cbb, #393053);
  background-size: 300% 300%;
  animation: dreamyMove 18s ease-in-out infinite;
}

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