.introduction h4 {
  margin: 0 0 .75rem 0;
  font-weight: bold;
  text-align: center;
}

.introduction_box {
  padding: 1.25rem 0 1.5rem 0;
  background-color: #F5F8FB;
  box-sizing: border-box;
}

.introduction span p {
  text-indent: 40px;
  line-height: .4rem;
}

.rail .l h4 {
  font-size: .375rem;
}

.rail_box {
  padding: 1.5rem 0;
}

.rail_box {
  background-image: url(../image/about/背景\ \(53\).png);
  background-position: center center;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  color: #fff;
}

.rail .l {
  width: 50%;
}

.rail .r {
  width: 30%;
}

.rail .r ul {
  flex-wrap: wrap;
}

.rail .r ul li {
  margin: 0 .125rem;
  line-height: .75rem;
}

.indc {
  margin: .375rem 0 0 0;
  font-size: .225rem;
  text-align: center;
}

.unitC {
  font-size: .2rem;
  color: #F58331;
}

.clearfix {
  display: flex;
  justify-content: space-between;
}

.numCX {
  font-size: .5rem;
  font-weight: bold;
  color: #F58331;
}

.main {
  position: relative;
  top: -1rem;
  left: 0;
  padding: 1rem;
  box-sizing: border-box;
  border-radius: 10px;
  background-color: #fff;
  box-shadow: 0 0 10px 2px rgba(0, 0, 0, 0.2);
}

.numU {
  display: flex;
  justify-content: center;
}

@media screen and (max-width: 1680px) {}

@media screen and (max-width: 1600px) {}

@media screen and (max-width: 1440px) {}

@media screen and (max-width: 1366px) {}

@media screen and (max-width: 1280px) {}

@media screen and (max-width: 1024px) {}

@media screen and (max-width: 980px) {
  .introduction_box {
    padding: 20px 0;
  }

  .introduction h4 {
    margin: 0 0 20px 0;
  }

  .introduction span p {
    line-height: 1.5;
  }

  .main {
    top: 0;
  }

  .rail_box {
    padding: 20px 0;
  }

  .rail .l,
  .rail .r {
    width: 100%;
  }

  .rail {
    flex-wrap: wrap;
  }

  .rail .l {
    margin: 0 0 15px 0;
  }

    .rail .r ul li {
      margin: 5px 5px;
    }
}

@media screen and (max-width: 768px) {}

@media screen and (max-width: 640px) {}

@media screen and (max-width: 375px) {}