.views-data-export-doc-attach,
.views-data-export-csv-attach,
.views-data-export-txt-attach,
.views-data-export-xls-attach,
.views-data-export-xml-attach {
  width: 36px;
  height: 14px;
  text-indent: -1000px;
  background-repeat: no-repeat;
  display: inline-block;
  outline: none;
}

.views-data-export-doc-attach {
  background-image: url(images/doc.png);
}

.views-data-export-csv-attach {
  background-image: url(images/csv.png);
}

.views-data-export-txt-attach {
  background-image: url(images/txt.png);
}

.views-data-export-xls-attach {
  background-image: url(images/xls.png);
}

.views-data-export-xml-attach {
  background-image: url(images/xml.png);
}