body { font-family: Arial, sans-serif; background: #eef4f7;
  margin: 0; min-height: 100vh; display: grid; place-items: center; }
main { background: white; padding: 32px; border-radius: 12px;
  box-shadow: 0 5px 25px #0001; text-align: center; }
h1 { color: #17445f; }