body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #0f1115;
  color: #e6e6e6;
}

header {
  background: #161a22;
  padding: 15px;
}

nav a {
  color: #9ad1ff;
  margin-right: 10px;
  text-decoration: none;
}

nav a:hover {
  text-decoration: underline;
}

main {
  padding: 20px;
}

button {
  padding: 10px 15px;
  background: #2d6cdf;
  color: white;
  border: none;
  cursor: pointer;
}