/* Lab04固有のスタイル */
#ruleImagesContainer {
  max-width: 540px;
  margin: 0 auto 24px auto;
}
.rule-image-item {
  margin-bottom: 16px;
}
.rule-image-title {
  font-size: 1.1em;
  font-weight: bold;
  margin-bottom: 8px;
  text-align: center;
  color: #222;
}