摘要：<style>#info{height:0px; width:0px;top:50%; left:50%;position:absolute;}#center{background:#FFCC33;border:1px solid #0033FF; width:300px;height:300px;position:absolute; margin:-150px;}</style><div id="info"><div id="center">我在中间吗</div></div> 阅读全文