code quảng cáo bên dưới trang web

<style>
div#fixedbox {  
    position: absolute;
    bottom: 0;
    width: 100%;
}

div#fixedbox {
    position: fixed;
    left : 0;
}
div#fixedbox .box-center-wg{
    width: 300px;height: 250px;margin: 0 auto;
    position: relative;
}
div#fixedbox .close-btn-wg{
    background:#D1D1D1 ;
    font-family: arial;
    font-size: 11px;line-height: 10px;
    font-weight: bold;
    color: #ff0000;
    right: 0;
    position: absolute;
    height: 10px;
    padding : 2px;
    width: 10px;
    cursor: pointer;
}

* html body {  
    height: 100%;
    overflow-y: auto;
}
* html div#fixedbox {
    position: absolute;
}
</style>



<div id="fixedbox" style="z-index:15;">
    <div class="box-center-wg">
        <div class="close-btn-wg" onclick="document.getElementById('fixedbox').style.display = 'none';">X</div>

<iframe frameborder="0" marginwidth="0" marginheight="0" scrolling="no" width="300" height="250" src="http://ad.adnetwork.net/st?ad_type=iframe&ad_size=300x250&section=2325219" ></iframe>
    
    </div>
  </div>