@media screen and (max-width: 499px) {
  header {
    min-height: 140px;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  header .banner-text h1 {
    font-size: 32px;
  }
  .content {
    padding: 20px 0;
  }
  .content .intro {
    box-sizing: border-box;
    padding: 10px 0;
    text-align: center;
  }
  .content .intro h2 {
    font-weight: normal;
  }
  .content .intro p {
    font-size: 14px;
  }
  .content .box-wrapper {
    display: block;
    justify-content: space-between;
  }
  .content .box-wrapper .box-item {
    width: 100%;
    margin-bottom: 50px;
    border: 1px #a0a0a0 solid;
  }
  .content .box-wrapper .box-item .box-image {
    width: 100%;
  }
  .content .box-wrapper .box-item .box-image img {
    width: 100%;
  }
  .content .box-wrapper .box-item .box-text {
    margin-top: 10px;
    box-sizing: border-box;
    padding: 20px 20px;
  }
  .content .box-wrapper .box-item:last-of-type {
    margin-bottom: 10px;
  }
  footer {
    background-color: #fff;
    box-sizing: border-box;
    padding: 20px 0;
  }
  footer img {
    height: 24px;
  }
}