body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}
header {

  color: white;
  padding: 1em;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  background: #333;
  overflow: hidden;
  margin: 0;
}
nav ul li {
  display: inline;
}
nav ul li a {
  display: inline-block;
  padding: 0.75em;
  color: white;
  text-decoration: none;
}
nav ul li a:hover {
  background: #111;
}
main {
  padding: 1em;
}
footer {
  background: #333;
  color: white;
  text-align: center;
  padding: 1em;
  position: relative;
  bottom: 0;
  width: 100%;
}

.slider {
  max-width: 100%;
  margin: 20px auto;
  position: relative;
  overflow: hidden;
}
.slides img {
  width: 100%;
  display: none;
}