body {
  color: #333;
}

header {
  text-align: center;
}

a {
  color: #3f72d1;
}

em {
  color: #ff7000;
}

strong {
  color: #ff3300;
}

nav, article {
  max-width: 800px;
  margin: auto;
}

nav {
  border: 1px solid;
  padding: 5px;
  box-sizing: border-box;
}

article img {
  max-width: 500px;
}

article figure {
  margin: auto;
  text-align: center;
}