* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  width: 100%;
  max-width: 600px;
  padding: 20px;
}

.card {
  background: white;
  padding: 40px;
  border-radius: 16px;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,.1);
}

button {
  background: #f38020;
  color: white;
  border: 0;
  padding: 12px 24px;
  border-radius: 8px;
  cursor: pointer;
}