body {
  margin: 0;
  font-family: sans-serif;
  line-height: 1.8;
  color: #222;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 16px;
}

.notice {
  margin: 0;
  padding: 8px 16px;
  background: #fff3cd;
  text-align: center;
}

.formal {
  padding: 12px 16px;
  background: #f1f5f1;
  border-left: 4px solid #4a8f4a;
}

footer {
  padding: 24px 16px;
  text-align: center;
  color: #666;
  font-size: 0.9em;
}