.popup_bg {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  margin: auto;
  z-index: 9999;
  width: 100%;
  height: 100%;
  transition: all .5s;
  z-index: -999;
}
.vc {
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
}
.popup_bg.on {
  z-index: 999999;
  background: rgba(0,0,0,.5);
}
.popup_bg .popup_box {
  background: #fff;
  width: 940px;
  max-width: 100%;
  padding: 30px;
  color: #000;
  margin-left: auto;
  margin-right: auto;
  display: inline-block;
  position: relative;
  max-height: 90%;
  overflow: auto;
}
.close_btn {
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  padding: 0;
  margin: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  z-index: 10;
  cursor: pointer;
}
.close_btn:after {
  content: '×';
  position: absolute;
  top: 5px;
  right: 5px;
  width: 30px;
  height: 30px;
  font: 22px/30px Arial,"Helvetica Neue",Helvetica,sans-serif;
  color: #888;
  font-weight: 300;
  text-align: center;
  border-radius: 50%;
  border-width: 0;
  background-color: transparent;
  transition: background-color .25s;
  box-sizing: border-box;
  z-index: 2;
}
.popup_bg .popup_box .popup_border {
  border: 1px solid #9a9a9a;
  padding: 10px;
  max-height: 100%;
  overflow: auto;
}