body {
  font-family: Arial, sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: white;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0px 4px 10px rgba(0,0,0,0.1);
  text-align: center;
  width: 300px;
}

h1 {
  margin-bottom: 1.5rem;
}

.btn {
  padding: 0.6rem 1.2rem;
  background: #24292f;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

.btn:hover {
  background: #444c56;
}