弹出层代码

<!--弹出框-->
<div class="pop_up" style="display:block;" id="update_ok">
    <div class="pop_up_bg"></div>
    <div class="pop_up_main">
        <div class="pop_up_sz"><p>修改成功</p></div>
        <!-- <div class="pop_up_dl"><a href="#">登 陆</a></div> -->
        <div class="confirmBtn" onclick="document.getElementById('update_ok').style.display='none';">确&nbsp定</div>
    </div>
</div>    
<!--弹出框-->  

<style type="text/css">
/*弹出框*/
body{
    font-family: "黑体","SimHei",sans-serif;
}
.pop_up {
    width: 100%;
    margin: 0 auto;
}
.pop_up_bg {
    width: 100%;
    height: 100%;
    position: fixed;
    background: #000;
    left: 0;
    top: 0;
    z-index: 15;
    -webkit-opacity: 0.5;
    /* Netscape and Older than Firefox 0.9*/
    -moz-opacity: 0.5;
    /* Safari 1.x (pre WebKit!) 老式khtml内核的Safari浏览器*/
    -khtml-opacity: 0.5;
    /* IE9 + etc...modern browsers*/
    opacity: .5;
    /* IE 4-9*/
    filter: alpha(opacity=50);
    /*This works in IE 8 & 9 too*/
    -ms-filter: "progid: DXImageTransform.Microsoft.Alpha(Opacity=50)";
    /*IE4-IE9*/
    filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=50);
}
.pop_up_main {
    width: 15%;
    margin: auto 42%;
    background: #fff;
    top: 40%;
    position: absolute;
    z-index: 22;
    /*padding: 5% 10%;*/
    border-radius: 10px;
}
.pop_up_sz {
    width: 90%;
    margin: 10% auto;
    overflow: hidden;
}
.pop_up .confirmBtn {
    width: 28%;
    margin:0 auto 5%;
    border-radius: 5px;
    background: #1881DC;
    text-align: center;
    height: 20px;
    line-height: 20px;
    color: white;
    cursor: pointer;
    padding: 10px 20px;
    font-size: 16px;
}
.pop_up_sz p {
    font-size: 18px;
    font-weight: bold;
    font-family: "微软雅黑";
    color: #000000;
    text-align: center;
}
.pop_up_dl {
    width: 90%;
    margin: 0 auto;
    overflow: hidden;
    margin-top: 6%;
    text-align: center;
}
.pop_up_dl a {
    padding: 2% 5%;
    background: #ff0000;
    color: #fff;
    font-size: 1.6vw;
    text-align: center;
    width: 50%;
    display: block;
    border-radius: 8px;
    margin-left: 14%;
}
/*弹出框end*/  
</style>

别人写的代码，蛮好，收藏了。

弹层
<!--弹出框-->
<div class="pop_up" style="display:none;" id="update_ok">
    <div class="pop_up_bg"></div>
    <div class="pop_up_main">
        <div class="pop_up_sz"><p>修改成功</p></div>
        <!-- <div class="pop_up_dl"><a href="#">登 录</a></div> -->
        <div class="confirmBtn" onclick="document.getElementById('update_ok').style.display='none';">确定</div>
    </div>
</div>    
<!--弹出框-->  


/*弹出框*/
.pop_up {
    width: 100%;
    margin: 0 auto;
}
.pop_up_bg {
    width: 100%;
    height: 100%;
    position: fixed;
    background: #000;
    left: 0;
    top: 0;
    z-index: 15;
    -webkit-opacity: 0.5;
    /* Netscape and Older than Firefox 0.9*/
    -moz-opacity: 0.5;
    /* Safari 1.x (pre WebKit!) 老式khtml内核的Safari浏览器*/
    -khtml-opacity: 0.5;
    /* IE9 + etc...modern browsers*/
    opacity: .5;
    /* IE 4-9*/
    filter: alpha(opacity=50);
    /*This works in IE 8 & 9 too*/
    -ms-filter: "progid: DXImageTransform.Microsoft.Alpha(Opacity=50)";
    /*IE4-IE9*/
    filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=50);
}
.pop_up_main {
    width: 30%;
    margin: auto 26%;
    background: #fff;
    top: 40%;
    position: absolute;
    z-index: 22;
    /*padding: 5% 10%;*/
    border-radius: 10px;
}
.pop_up_sz {
    width: 90%;
    margin: 10% auto;
    overflow: hidden;
}
.pop_up .confirmBtn {
    width: 80%;
    margin:0 auto 5%;
    border-radius: 5px;
    background: red;
    text-align: center;
    height: 24px;
    line-height: 24px;
    color: white;
    cursor: pointer;
}
.pop_up_sz p {
    font-size: 1.7vw;
    font-weight: bold;
    font-family: "微软雅黑";
    color: #000000;
}
.pop_up_dl {
    width: 90%;
    margin: 0 auto;
    overflow: hidden;
    margin-top: 6%;
    text-align: center;
}
.pop_up_dl a {
    padding: 2% 5%;
    background: #ff0000;
    color: #fff;
    font-size: 1.6vw;
    text-align: center;
    width: 50%;
    display: block;
    border-radius: 8px;
    margin-left: 14%;
}
/*弹出框end*/