body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0; padding: 0;
  background-color: #0e1117;
  color: #f0f0f0;
}
header {
  background-color: #1f2937;
  padding: 20px;
  text-align: center;
}
nav a {
  color: #90cdf4;
  margin: 0 15px;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}
main {
  padding: 20px;
}
footer {
  text-align: center;
  padding: 10px;
  background-color: #1f2937;
  color: #aaa;
}
ul {
  list-style-type: disc;
  padding-left: 20px;
}