.slider{
	width: 95%;
	margin: auto;
	overflow: hidden;
	
}
.slider ul{
	display: flex;
	padding: 0;
	width: 400;
	animation: cambio 20s infinite alternate linear;
}

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

.slider img{
	width: 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%;}
}