body {
  margin: 0;
  font-family: monospace;
  background: #0d1117;
  color: #c9d1d9;
}

header {
  padding: 20px;
  border-bottom: 1px solid #222;
}

nav a {
  margin-right: 15px;
  color: #58a6ff;
  text-decoration: none;
}

nav a:hover {
  color: #1f6feb;
}

main {
  padding: 40px;
  max-width: 800px;
  margin: auto;
}

footer {
  text-align: center;
  padding: 20px;
  border-top: 1px solid #222;
  font-size: 14px;
}