bold the numbers in a ol li list

HTML

<ol class='bold-list'>
<li>item</li>
<li>item</li>
<li>item</li>
</ol>

CSS

ol.bold-list {
  margin: 0 0 1.5em;
  padding: 0;
  counter-reset: item;
}

ol.bold-list > li {
  margin: 0;
  padding: 0 0 0 2em;
  text-indent: -2em;
  list-style-type: none;
  counter-increment: item;
}

ol.bold-list > li:before {
  display: inline-block;
  width: 1em;
  padding-right: 0.5em;
  font-weight: bold;
  text-align: right;
  content: counter(item) ".";
}