html底部div固定在底部

    <div class="footer_div2">
        <a href="/go.html?url=#">

        <p id="footer_text">我的账户</p>
        </a>
    </div>
    样式描述：
    .footer_div_outer{
width: 100%;height:45px;
 _position:absolute;
z-index:999; position:fixed; bottom:0; left:0;
 _top: expression_r(documentElement.scrollTop + documentElement.clientHeight-this.offsetHeight); 
 overflow:visible;
    <di