更新图片与css文件，细节位置还待调整

2020/x-3/download/css-mobile/index-mobile.css

.app-fun-block-item-im .img {
  margin-top: .29rem;
  height: 3.51rem;
  background: url("../img/fun-im-bg.png") left center no-repeat;
  background: url("../img-mobile/fun-im-bg.png") left center no-repeat;
  background-size: 3.58rem 3.52rem;
  overflow: auto;
}
  width: 2.45rem;
  height: 2.41rem;
  margin: .7rem auto 0;
  background: url("../img/fun-im.png") left center no-repeat;
  background: url("../img-mobile/fun-im.png") left center no-repeat;
  background-size: 2.21rem auto;
}
  width: 2.45rem;
  height: 2.59rem;
  margin: .3rem auto;
  background: url("../img/fun-group.png") center center no-repeat;
  background: url("../img-mobile/fun-group.png") center center no-repeat;
  background-size: 100% auto;
}
.app-fun-block-item-group .main-content {
  background: url("../img/fun-group-bg.png") left 1.34rem no-repeat;
  background: url("../img-mobile/fun-group-bg.png") left 1.34rem no-repeat;
  background-size: 3.1rem auto;
  padding-bottom: .16rem;
}
.app-fun-block-item-it .img {
  margin-top: .2rem;
  height: 3.34rem;
  background: url("../img/fun-it-bg.png") right center no-repeat;
  background: url("../img-mobile/fun-it-bg.png") right center no-repeat;
  background-size: 3.06rem auto;
  overflow: auto;
}
  margin: .7rem auto 0;
  width: 2.7rem;
  height: 1.89rem;
  background: url("../img/fun-it.png") left center no-repeat;
  background: url("../img-mobile/fun-it.png") left center no-repeat;
  background-size: 2.6rem auto;
}