body {
	margin: 0;
	width: 100%;
	height: 100vh;
    background: linear-gradient(90deg, #fff, #ffff00, #00ffff, #00ff00,#ff00ff,#ff0000, #0000ff,#000 );
	background-size: 400% 400%;
	animation: gradientBG 30s ease infinite;
}
@keyframes gradientBG {
	0% {background-position: 0% 50%; }
	50% {background-position: 100% 50%;	}
	100% {background-position: 0% 50%;	}
}
.container{ background:#fff; }