.contents {
  margin-top: 0;
}

.preparation {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  color: #0b66b7;
  font-weight: bold;
  font-size: 24px;
  width: 90%;
  height: 400px;
  margin: 0 auto;
}

@media screen and (max-width: 768px) {
  .preparation {
    font-size: 21px;
    max-width: 400px;
    height: 300px;
  }
}