.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;

         }