body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #0f172a;
  color: white;
}

header {
  background: #16a34a;
  padding: 20px;
  text-align: center;
}

main {
  padding: 20px;
}

.card {
  background: #1e293b;
  margin-bottom: 20px;
  padding: 20px;
  border-radius: 10px;
}

h2 {
  color: #22c55e;
}

pre {
  background: black;
  padding: 10px;
  overflow-x: auto;
  border-radius: 5px;
}

button {
  background: #22c55e;
  border: none;
  padding: 10px;
  cursor: pointer;
  margin: 10px 0;
  border-radius: 5px;
}

button:hover {
  background: #16a34a;
}

footer {
  text-align: center;
  padding: 15px;
  background: #111827;
}