求教CSS文字居中问题_html/css_WEB-ITnose

<div class="listarticle">	<li>						<a href="#" target="_blank"><img src="http://preview.quanjing.com/rob_pre002/rob-728-4336.jpg" title="" alt=""></a><br>                         <a href="#" title="这里居中显示" target="_blank">这里居中显示</a>                        </li>                        </div>						<style>.listarticle{margin-top:15px;}.listarticle li { float:left; width:250px; line-height:40px; margin:0px 0px 0px 40px;}.listarticle li img{padding:5px; width:220px; height:150px; border:solid 1px #ccc}.listarticle li img:hover{border:solid 1px #87CEEB}.listarticle li a{color:#383838;font-size:14px;font-weight: 500;}.listarticle li a:hover {color:#3A5FCD;-moz-transition:color .2s ease-in;-webkit-transition:color .2s ease-in;-o-transition:color .2s ease-in;transition:color .2s ease-in;}						</style>