body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #fff;
  color: #222;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.center {
  text-align: center;
  max-width: 600px;
  padding: 20px;
}