body {
  font-family: Arial;
  background: #0f172a;
  color: white;
  text-align: center;
}

header {
  padding: 50px;
}

.btn {
  background: #22c55e;
  padding: 10px 20px;
  color: white;
  text-decoration: none;
}

.grid {
  display: flex;
  justify-content: center;
  gap: 10px;
}

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

.container {
  display: flex;
  justify-content: center;
}

input, button {
  margin: 10px;
  padding: 10px;
}