body {
  font-family: Arial, sans-serif;
  background: #f3f3f3;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #fff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  width: 300px;
}
h1 {
  margin-bottom: 10px;
}
button {
  padding: 10px;
  width: 100%;
  background-color: #4CAF50;
  color: white;
  border: none;
  border-radius: 6px;
}