#mask {
  position:fixed;
  left:0;
  top:0;
  z-index:99999999999;
  background-color:#001f6fc4;
    width: 100vw;
    height: 100vh;
    opacity: 1!important;
}  
.window {
  position: relative;
  width:70%;
  margin: 15% auto 0 auto;
}
.close{
    width:25px;float:right;z-index:999999999999999999999;position: absolute;right:-25px;top:-23px
}