body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
}

header {
  background-color: #f4f4f4;
  padding: 20px;
  text-align: center;
}

h1 {
  font-size: 36px;
  margin: 0;
}

nav {
  display: flex;
  justify-content: space-around;
  background-color: #333;
  padding: 10px;
}

.page-link {
  color: white;
  text-decoration: none;
}

section {
  max-width: 800px;
  margin: 20px auto;
  padding: 20px;
  background-color: #f9f9f9;
  border-radius: 5px;
}

footer {
  text-align: center;
  padding: 10px;
  background-color: #333;
  color: white;
}

.page-content {
  font-size: 1.3em;
  margin: 2em auto;
  max-width: 45em;
  padding: 0 1em;
}

img {
  max-width:100%;
}

ul.index {
  list-style-type: none;
  padding: 0;
}

ul.index li {
  margin-bottom: 0.5em;
}