a[href$='.docx']:before {
  padding-right: 10px;
  content: url("/sites/all/themes/custom/cruk/images/cruk-icons/word.png");
  position: relative;
  top: 2px;
}

a[href$='.pptx']:before {
  padding-right: 10px;
  content: url("/sites/all/themes/custom/cruk/images/cruk-icons/ppt.png");
  position: relative;
  top: 2px;
}