body {
  font-family: 'Segoe UI', 'Hiragino Sans', 'Meiryo', sans-serif;
  background: #f9f9f9;
  color: #222;
  margin: 0;
  padding: 0;
}
main {
  max-width: 600px;
  margin: 5vh auto 0 auto;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
  padding: 2.5rem 2rem 2rem 2rem;
  text-align: center;
}
h1 {
  font-size: 2.2rem;
  margin-bottom: 1.2rem;
}
p {
  font-size: 1.1rem;
  margin-bottom: 2rem;
}
footer {
  margin-top: 2rem;
  color: #888;
  font-size: 0.95rem;
}