.col-xs-12.col-sm-12.col-md-12.xcang {
  position: sticky;
  top: 100px;
  margin-left: 5px;
  right: 20px;
  z-index: 998;
  background-color: rgb(255, 255, 255);
}

.c1 {
  position: sticky;
  top: 0px;
  z-index: 999;
}