.Div_Scroll {
position:fixed;
margin:-10px;
visibility:hidden;
background-color:#808080;
opacity:0.6;
z-index:99;
}
.Div_Scroll_Content {
position:relative;
margin-top:20%;
width:inherit;
height:inherit;
}
.Div_alertWindow {
margin:auto;
width:200px;
height:100px;
background-color:lightblue;
border:5px solid #f00;
}
添加遮罩层
