css设置图片在div中居中

HTML代码
            <img src="images/default-icon-1024.png" class="img_blur pos-abs zidx-1"/>

            <img src="images/default-icon-1024.png" class="pos-abs icon-pos-center zidx-2"/>

CSS代码毛玻璃效果：.img_blur { -webkit-filter: blur(10px); /* Chrome, Opera */ -moz-filter: blur(10px); -ms-filter: blur(10px); filter: blur(10px); filter: progid:DXImageTransform.Microsoft.Blur(PixelRadius=10,
MakeShadow=false); /* IE6~IE9 */}.pos-abs{ position:absolute;}.pos-re{ position:relative;}图片居中效果.icon-pos-center{ top:50%; left:50%; width:160px; height:160px; margin-top:-80px; margin-left:-80px;}.zidx-1{ z-index:1;}.zidx-2{ z-index:2;}