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效果图

css代码

<style type="text/css" >body{
     font-family: "Microsoft YaHei" ! important;
}/*灰色遮罩层*/.fade{
    width:100%;
    height:100%;
    background:rgba(0, 0, 0, 0.5);
    position: fixed;
    left: 0;
    top: 0;
    z-index: 99;
}/*弹出层*/ 
.succ-pop{
    width: 400px;
    height: 300px;
    background: #fff;
    position: fixed;
    left: 50%;
    top: 50%;
    margin-left: -200px;
    margin-top: -150px;
    z-index: 999;
    border-radius: 5px;
}   
.succ-pop h3.title{
    text-align: center;
    font-size: 22px;
    color: #ce002c;
}</style>

html代码

<div class="fade"></div>
<div class="succ-pop">
    <h3 class="title">
        中间填写内容
    </h3>
</div>