CSS-div漂浮

<div style="width:100%;border-top:0px solid #999999;">
            <div style="width:100%;text-align:center;font-size:10px;margin:-6px 0 10px 0;">
                <span style="background-color:#fff;width:110px;">选择预约时间</span>
            </div>
            <div style="width:100%;text-align:center;border:1px solid #000;"></div>
            <div style="width:100%;text-align:center;margin-top:-10px;">
                <span id="curMonth" style="background-color:#fff;width:110px;"></span>
            </div>
        </div>