.slider{
/*	width:75%;*/
	margin:auto;
	margin-top: -1%;
	overflow:hidden;
}

.slider ul{
	display: flex;
	padding:0;
	width:400%;
	animation : cambio 20s infinite alternate linear;
}

.slider li{
	width:100%;
	list-style: none;
	
}

.slider img{
	width:100%;
	height: 100%;
}

@keyframes cambio {
	0% {margin-left: 0;}
	20% {margin-left: 0;}

	25% {margin-left : -100%}
	45% {margin-left : -100%}

	50% {margin-left : -200%}
	70% {margin-left : -200%}

	75% {margin-left : -300%}
	100% {margin-left : -300%}
}