body {
  font-family: sans-serif;
  text-align: center;
  padding: 50px;
  background: #f4f4f4;
  color: #333;
}
.container {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
h1 {
  color: #e74c3c;
}
p {
  line-height: 1.6;
}
.btn {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 20px;
  background: #3498db;
  color: white;
  text-decoration: none;
  border-radius: 5px;
}