.puzzle-area {
  width: 100%;
  margin-top: 30px;
}
.puzzle-area .sample-image {
  width: 25%;
  float: left;
}
.puzzle-area .sample-image img {
  max-width: 100%;
  height: auto;
}
.puzzle-area .sample-image figcaption {
  text-align: center;
}
.puzzle-area .puzzle-item {
  width: 70%;
  float: right;
}
.puzzle-area .reward-link {
  text-align: center;
  margin-top: 30px;
}
.puzzle-area .reward-link span {
  display: inline-block;
}