body {
  font-family: Arial, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background: #f5f5f5;
}
main {
  text-align: center;
  background: #ffffff;
  padding: 40px 60px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
h1 {
  margin-top: 0;
}
a {
  color: #0074d9;
  text-decoration: none;
}