css

<!DOCTYPE html>
<html>
<head>
<style> 
p:nth-child(2) {
  background: red;
}
</style>
</head>
<body>
​
<p>The first paragraph.</p>
<p>The second paragraph.</p>
<p>The third paragraph.</p>
<p>The fourth paragraph.</p>
​
<p><b>Note:</b> Internet Explorer 8 and earlier versions do not support the :nth-child() selector.</p>
​
</body>
</html>
​
<!-- Create an icon wrapped by the fa-stack class -->
<span class="fa-stack">
    <!-- The icon that will wrap the number -->
    <span class="fa fa-circle-o fa-stack-2x"></span>
    <!-- a strong element with the custom content, in this case a number -->
    <strong class="fa-stack-1x">
        2    
    </strong>
</span>

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