.content {
  margin-bottom: 80px;
}
@media (max-width: 767px) {
  .content-header {
    margin-bottom: 24px;
  }
  .content-header img {
    width: 207px;
    height: 51px;
  }
}
.content-header::after {
  display: block;
  width: 100%;
  height: 0;
  padding-top: 38.888888888%;
  content: "";
  background-image: url("../img/top/challenge.jpg");
  background-repeat: no-repeat;
  background-position: center;
}
@media (max-width: 767px) {
  .content-header::after {
    margin-top: 24px;
  }
}
@media (min-width: 768px) {
  .content-header::after {
    margin-top: 40px;
  }
}
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
  .content-header::after {
    background-image: url("../img/top/challenge@2x.jpg");
    background-size: 100% 100%;
  }
}
.content-description {
  max-width: 630px;
  padding-right: 16px;
  padding-left: 16px;
  margin-right: auto;
  margin-bottom: 24px;
  margin-left: auto;
  font-size: 12px;
  line-height: 29px;
  text-align: justify;
  text-justify: inter-ideograph;
}
.content-description p {
  margin-top: 0;
  margin-bottom: 0;
}
.content-subheader {
  margin-top: 48px;
  margin-bottom: 0;
  font-size: 20px;
  line-height: 1;
  text-align: center;
}
.content-list {
  margin-top: 24px;
}
@media (max-width: 899px) {
  .content-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-around;
  }
  .content-list::after {
    display: block;
    width: 324px;
    content: "";
  }
}
.content-item {
  margin-top: 12px;
}
@media (max-width: 899px) {
  .content-item {
    width: 300px;
    padding: 12px;
  }
  .content-item dl {
    box-sizing: border-box;
    padding: 16px;
    margin-top: 0;
    margin-bottom: 0;
    background-color: #fff;
  }
  .content-item dl dt {
    font-size: 16px;
    line-height: 27px;
  }
  .content-item dl dd {
    margin-left: 0;
    font-size: 12px;
    line-height: 27px;
  }
  .content-item dl dd p {
    margin-top: 0;
    margin-bottom: 10;
  }
  .content-item .text {
    padding: 16px;
    font-size: 12px;
    line-height: 27px;
    background-color: #fff;
  }
  .content-item .text p {
    margin-top: 0;
    margin-bottom: 0;
  }
}
@media (min-width: 900px) {
  .content-item {
    background-color: #fff;
  }
  .content-item::after {
    display: block;
    clear: both;
    content: "";
  }
  .content-item .image {
    float: left;
  }
  .content-item dl {
    box-sizing: border-box;
    float: left;
    width: 568px;
    padding: 16px 16px 0;
    margin-top: 0;
    margin-bottom: 0;
  }
  .content-item dl dt {
    font-size: 16px;
    line-height: 27px;
  }
  .content-item dl dd {
    margin-left: 0;
    font-size: 12px;
    line-height: 27px;
  }
  .content-item dl dd p {
    margin-top: 0;
    margin-bottom: 10;
  }
  .content-item .text {
    float: left;
    width: 568px;
    padding: 16px;
    font-size: 12px;
    line-height: 27px;
  }
  .content-item .text p {
    margin-top: 0;
    margin-bottom: 0;
  }
}