Decimal Leading Zero CSS Counter Reference: http://test.csswg.org/suites/css2.1/20101210/xhtml1/content-counter-006.xht http://www.w3.org/TR/2013/WD-css-counter-styles-3-20130718/#counter-styles

CSS

#test { counter-reset: c; }
#test span { counter-increment: c; }
#test span:before { content: counter(c, decimal-leading-zero); }

Ordered List Usage

ol > li {
    position:relative; /* Create a positioning context */
    margin:0; /* Give each list item a left margin to make room for the numbers */
    padding:30px 0 30px 70px; /* Add some spacing around the content */
    list-style:none; /* Disable the normal item numbering */
    border-top:1px solid @black-20;
    background: @white;
}
ol > li:before {
  counter-increment:li; /* Increment the counter by 1 */
  content: counter(li, decimal-leading-zero);
  position:absolute;
  top: 20px;
  left:0px;
  -moz-box-sizing:border-box;
  -webkit-box-sizing:border-box;
  box-sizing:border-box;
  /* Some space between the number and the content in browsers that support
     generated content but not positioning it (Camino 2 is one example) */
  margin-right:30px;
  padding:17px 0;
  border-top:1px solid @black-20;
  color:@blue;
  background:url(/images/ol-circle.png) no-repeat 0 0;
  font-weight:bold;
  font-family: @serif;
  text-align:center;
  .font-size(19);
  width: 55px;
  height: 55px;
}