body {
  background: #1a1a1a;
  color: #fff;
  font-family: sans-serif;
  margin: 0;
  padding: 1rem;
}
nav a {
  color: #fff;
  margin-right: 1rem;
  text-decoration: none;
}
nav a.active {
  font-weight: bold;
}
img {
  max-width: 100%;
}