body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  padding: 0;
  background: #f5f5f5;
  color: #333;
}

header {
  background: #0f172a;
  color: #fff;
  padding: 20px;
  text-align: center;
}

header a {
  color: #38bdf8;
  text-decoration: none;
}

main {
  padding: 20px;
}

article {
  background: #fff;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

footer {
  text-align: center;
  padding: 10px;
  background: #e2e8f0;
}