body {
  font-family: sans-serif;
  margin: 0;
  padding: 0;
  background: #fff;
  color: #1c1c1c;
}
header, footer {
  background: #002f34;
  color: white;
  padding: 1rem;
  text-align: center;
}
nav a {
  margin: 0 1rem;
  color: white;
  text-decoration: none;
}
main {
  padding: 2rem;
}
a {
  color: #00646d;
}