.slider {
	width: 100%;
	top:0px;
	margin: 0px;
	overflow: hidden;
}

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

.slider li {
	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%;}
}

.slider__nav {
  box-sizing: border-box;
  position: absolute;
  bottom: 5%;
  left: 50%;
  width: 200px;
  margin-left: -100px;
  text-align: center;
}

.slider__navlink {
  display: inline-block;
  height: 15px;
  width: 15px;
  border-radius: 50%;
  background-color: black;
  margin: 0 10px 0 10px;
}