图片显示、PNG透明

css:margin:0pxauto; 自动居中display:block; 块显示，图片自动伸缩width:400px;height:400px; 透明示例： width: 325px; height: 378px; display: block; position: absolute; top: 0px; bottom: 0px; right: 0px; z-index: 100; margin: auto 0px auto 0px; opacity:0.9; -moz-opacity:0.9; -khtml-opa...