.section_documents ul li a div {
    display: block;
    width: 32px;
    min-width: 32px;
    height: 32px;
    min-height: 32px;
    margin: 0 3px 0 0;
}
.section_documents ul li a[href $='.pdf'] div {
  background: transparent url(/template/img/pdf.png) no-repeat;
}

.section_documents ul li a[href $='.jpg'] div {
  background: transparent url(/template/img/jpg.png) no-repeat;
}

.section_documents ul li a[href $='.docx'] div {
  background: transparent url(/template/img/docx.png) no-repeat;
}

.section_documents ul li a span {
  margin-top: 6px;
  margin-left: 5px;
}

.highlight {
      background-color: yellow;
    }