body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f7fb;
  color: #1f2937;
}

.container {
  max-width: 800px;
  margin: 80px auto;
  padding: 40px;
  background: white;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.08);
  text-align: center;
}

button {
  padding: 12px 20px;
  border: 0;
  border-radius: 10px;
  background: #2563eb;
  color: white;
  cursor: pointer;
}