body {
    text-align: center;
	background: linear-gradient(-45deg, #7095bc, #a4554a, #639cac, #887e43);
	background-size: 400% 400%;
	animation: gradient 15s ease infinite;
	height: 100vh;
}
.oo{
    display: flex;
    margin: auto auto;
    max-width: 100%;
    width: 450px;
}
@keyframes gradient {
	0% {
		background-position: 0% 50%;
	}
	50% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0% 50%;
	}
}