body{
  background-color: white;
  font-family: sans-serif;
}

.container{
  margin: auto;
  background-color: white;
  width: 800px;
  padding: 15px;
}

ul, li {
    padding: 0;
    margin: 0;
    list-style: none;
}

ul.slider{
  position: relative;
  width: 800px;
  height: 600px;
}

ul.slider li {
    position: absolute;
    left: 0px;
    top: 0px;
    opacity: 0;
    width: inherit;
    height: inherit;
    transition: opacity .5s;
    background:#fff;
}

ul.slider li img{
  width: 100%;
  height: 600px;
  object-fit: cover;
}

ul.slider li:first-child {
    opacity: 1; /*Mostramos el primer <li>*/
}

ul.slider li:target {
    opacity: 1; /*Mostramos el <li> del enlace que pulsemos*/
}

.menu{
  text-align: center;
  margin: 24px;
}

.menu li{
  display: inline-block;
  text-align: center;
}

.menu li a{
  display: inline-block;
  color: white;
  text-decoration: none;
  background-color: grey;
  padding: 12px;
  width: 16px;
  height: 16px;
  font-size: 15px;
  border-radius: 100%;
}