.demo {

? ? width: 300px;

? ? height: 140px;

? ? border: 1px solid #999;

? ? background: rgba(100,100,100,0.5) url(http://static.mukewang.com/static/img/logo_index.png) left top no-repeat ,?

? ? ? ? ? ? ? ?url(http://static.mukewang.com/static/img/logo_index.png) right bottom no-repeat;

}