.wrap__sticky__article{
  position: relative;
  width: 300px;
  height: 500px;
  background: #eee;
  margin: 0 auto;
  overflow: hidden;
}
.wrap__sticky__article2{
  height: 250px !important;
}
.line_show{
  position: absolute;
  height: 5px;
  width: 100%;
  z-index: 9999;
}
.line_show.line_show--a{
  top: -55px;
  background: red;
}
.line_show.line_show--b{
  top: 187px;
  background: blue;
}
.sticky__article{
  position: relative;
  width: 300px;
}
.sticky__article.fix{
  position: fixed;
  top: 57px;
}
.wrap__sticky__article img{
  width: 100%;
  position: absolute;
  left: 0;
  top: 0;
}
.wrap__sticky__article .bg{
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 0;

}