User:Felsir/common.js

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#content a[href$=".xls"].external,
#content a[href$=".XLS"].external,
#content a[href$=".xlsx"].external,
#content a[href$=".XLSX"].external
 {
    background: url("http://upload.wikimedia.org/wikipedia/commons/b/ba/Page_white_excel.png") center right no-repeat; padding-right: 18px;
}