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background:url(图片路径) center top no-repeat;
你说的上面置顶是居上显示吧?如果是,上面css就可以实现啊。
background-position 属性设置背景图像的起始位置。
第一个值是水平位置,第二个值是垂直位置。
像你提的这个问题就可以用这个属性
background-position:center top;
div{ background:url(../images/bg.png) no-repeat center top;}