body {
	width: 100%;
	height: 100vh;
	margin: 0;
	padding: 0;
	font-family: "montserrat";
	background-image: linear-gradient(125deg,#2c3e50,#27ae60,#2980b9,#e74c3c,#8e44ad);
	background-size: 400%;
	animation: wangbo 10s infinite;
}
@keyframes wangbo{
	0% {
		background-position: 0% 50%;
	}
	50% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0% 50%;
	}
}