.file-type-xlsx{
    background: url(/portal/datasets/home-datasets/images/xls.gif) no-repeat scroll 0 0 transparent;
    padding-left: 20px;
}
.file-type-pdf {
    background: url(/portal/datasets/home-datasets/images/pdf.gif) no-repeat scroll 0 0 transparent;
    padding-left: 20px;
}