css报错问题？

body:after

{ content: url(../img/close.png) url(../img/loading.gif) url(../img/prev.png) url(../img/next.png); display: none; }

lightbox.css:4Uncaught SyntaxError优艾设计网_Photoshop百科: Unexpected token .

一直报这个错误，找不到原因？

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