body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f4f6f8;
  color: #333;
}

header {
  background: #1f2933;
  color: white;
  padding: 20px;
  text-align: center;
}

nav {
  background: #111827;
  padding: 10px;
  text-align: center;
}

nav a {
  color: white;
  margin: 0 15px;
  text-decoration: none;
}

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

main {
  padding: 20px;
}

article {
  background: white;
  padding: 15px;
  margin-bottom: 20px;
  border-radius: 5px;
}

button {
  padding: 8px 12px;
  border: none;
  background: #2563eb;
  color: white;
  cursor: pointer;
}

button:hover {
  background: #1d4ed8;
}

footer {
  text-align: center;
  padding: 10px;
  background: #e5e7eb;
}