header {
	position: relative;
	margin: 20px auto;
	text-align: center;
}

nav ul {
	width: 1100px;
	list-style: none;
}

nav li {
	display: inline-block;
}

nav li a {
	display: block;
	padding: 20px;
	text-align: center;
}


.container {
  max-width: 400px;
  background-color: black;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.container div {
  background-color: white;
  width: 100%;
  display: inline-block;
  display: none;
}
.container img {
  width: 100%;
  height: auto;
}

button {
  position: absolute;
}

.next {
  right: 5px;
}

.prev {
  left: 5px;
}

.logo {
  position:center;
   display: block;
    margin-left: auto;
    margin-right: auto ;
}