#tianai-captcha.tianai-captcha-concat {
  .tianai-captcha-slider-concat-img-div {
    background-size: 100% 180px;
    position: absolute;
    transform: translate(0px, 0px);
    /* border-bottom: 1px solid blue; */
    z-index: 1;
    width: 100%;
  }
  .tianai-captcha-slider-concat-bg-img {
    width: 100%;
    height: 100%;
    position: absolute;
    transform: translate(0px, 0px);
    background-size: 100% 180px;
  }
}