body{
	margin:0;
	padding:0;
}
.slider{
	width: 1335px;
	height: 379px;
	background: url(s1.jpg);
	margin: 0px auto;
	overflow: hidden;
	animation: slide 20s infinite;
}
@keyframes slide{
	25%{
		background: url(s2.JPG);
	}
	50%{
		background: url(s3.JPG);
	}
	75%{
		background: url(s4.jpg);
	}
	100%{
		background: url(s1.JPG);
	}
}