.banner-wrap {
  position: relative;
  height: calc(100vh - 5.3646vw);
  position: relative;
}
.banner-wrap > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.banner-wrap .mask {
  position: absolute;
  top: 278px;
  right: 19.0104vw;
  font-size: 1.25vw;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #FFFFFF;
  width: 25.1563vw;
  line-height: 1.7;
}


.rich-text {
  max-width: 1200px;
  margin: 50px auto 92px;
  text-align: center;
  font-size: 18px;
  font-family: Microsoft YaHei;
  font-weight: 400;
  color: #4D4D4D;
  line-height: 36px;
}
.rich-text.mbc {
  display: none;
}
.rich-text img {
  max-width: 100%;
}

@media screen and (max-width: 640px) {
  .rich-text.mpc {
    display: none;
  }
  .rich-text.mbc {
    display: block;
  }
  .banner-wrap {
    height: 300px;
  }
  .banner-wrap .mask {
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.5);
    padding: 30px;
    font-size: 16px;
  }
  .rich-text {
    padding: 0 10px;
    margin: 30px auto 55px;
  }
  .rich-text img:first-child {
    display: none;
  }
  .rich-text img:last-child {
    display: block;
  }
}