.background {
  position: fixed;
  top     : 128px;
  left    : 0; 
  width   : 100%;
  height  : 100vh;
  background-color: rgba(0, 0, 0, 0.3);
  z-index : 10000;
  /* ¼û±â±â */
  z-index : -1;
  opacity : 0;
}

.show {
  opacity : 1;
  z-index : 1000;
  transition : all 0.5s;
}

.window {
  position: relative;
  width : 100%;
  height: 100%;
}

.popUp {
  margin : 5px;
  float  : left;
  width  : 20%;
  aspect-ratio : 10/8;
}

.popUp .pop_container,
.popUp .pop_container img{
	width :100%;
/*  height: 90%; */
}
.btn_close{
	display   : block;
    background: none;
    border: none;
    color : #fff;
    font-size: 14px;
    width : 40px;
    float : right;
}

.btn_close2{
	display: block;
    background: none;
    border: none;
    color: #fff;
    font-size: 14px;
    width : 40px;
    float : right;
}
.btn_dont_show2,
.btn_dont_show {
    display: block;
    background: none;
    border : none;
    color  : #fff;
    font-size: 14px;
    width : 170px;
    float : left
}

.show .popUp {transition: all 0.5s;}

.btn_close  { display: block; visibility: visible; }
.btn_close2 { display: none; visibility: hidden; }
.btn_dont_show  { display: block; visibility: visible; }
.btn_dont_show2 { display: none; visibility: hidden; }

.main_banner{
  aspect-ratio : 4/3;
}