#platformsup .hall_case {
  padding: 0 0 0 0;
  width: 1400px;
  height: 680px;
  position: relative;
  overflow: hidden;
}

#platformsup .hall_case .experience-hall {
  max-width: 1400px;
  margin: 0px auto;
  height: 680px;
}

#platformsup .hall_case .experience-hall ul {
  width: 800%;
  height: 680px;
  transform: translate3d(0px, 0px, 0px);
}

/* #platformsup .hall_case .experience-hall ul li:hover {
  width: 800px;
} */

#platformsup .hall_case .experience-hall ul li {
  overflow: hidden;
  position: relative;
  float: left;
  width: 298px;
  height: 680px;
  margin-right: 6px;
  transition: all 1.2s cubic-bezier(0.19, 1, 0.22, 1);
  display: block;
}

#platformsup .hall_case .experience-hall ul li img {
  max-width: none !important;
}