CSS horizontal line on one side of text
<p>I want to create horizontal line on left side of my text. I have somethink like this, but it's creating line on both sides but I want only on one side - left or right. How can I do this?</p>

<pre><code>h2 {
  width: 100%;
  text-align: center;
  border-bottom: 1px solid #000;
  line-height: 0.1em;
  margin: 10px 0 20px;
}

h2 span {
  background: #fff;
  padding: 0 10px;
}
</code></pre>

<p>Demo: <a href="http://jsfiddle.net/7jGHS/" rel="noreferrer">http://jsfiddle.net/7jGHS/</a></p>