.i4 {
  padding-bottom: 0.8rem;
  background: url(../images/bg.png) bottom left no-repeat;
  background-size: 100% auto;
}
.i4 .i4-container .main-content {
  overflow: hidden;
  margin-top: 0.5rem;
}
.i4 .i4-container .main-content li {
  width: 2rem;
  height: 0.8rem;
  line-height: 0.8rem;
  float: left;
  text-align: center;
  font-size: 0.3rem;
}
@media screen and (max-width: 1024px) {
  .i4 .i4-container .main-content li {
    width: 33.3333%;
    height: 1rem;
    line-height: 1rem;
  }
}
.i4 .i4-container .main-content li img {
  display: inline-block;
  max-width: 90%;
  height: auto;
  vertical-align: middle;
}