利用css3背景位置完成拼图

     .duo {
             width: 623px;
             height: 417px;
             margin: 100px auto;
             background: url(images/bg1.png) left top no-repeat,
                         url(images/bg2.png) right top no-repeat,
                         url(images/bg3.png) right bottom no-repeat,
                         url(images/bg4.png) left bottom no-repeat,
                         url(images/bg5.png) center center no-repeat;
             background-color: #FFF;
         }