@media screen and (max-width: 768px) {
  .banner .mo_txt {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    transform: translateY(0);
    height: 1.1rem;
    margin: 0 0.6rem 0.5rem;
    background-image: url(../images/banner/bg_1.png);
    background-size: 100% 100%;
  }

  .banner dl.b_middle dd.mo_about {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    transform: translateY(0);
    height: 1.1rem;
    margin: 0 0.6rem 0.5rem;
    background-image: url(../images/banner/bg_2.png);
    background-size: 100% 100%;
  }

  .context {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100%;
  }
  .context span {
    font-size: 0.26rem;
    font-weight: 100;
  }
  .context em {
    font-size: 0.2rem;
  }
}