title: Extend Bootstrap CSS and add some more styles
body: <p>I want to know how to extend a CSS and add some more properties to it.
  For example:  </p>
  
  <pre><code>&lt;a title="Not clickable" class="pull-right btn"&gt;&lt;span class="icon"&gt;&lt;/span&gt;&lt;/a&gt;
  </code></pre>
  
  <p>The above line of code is using pull-right btn defined by bootstrap css.
  Now, I dont want to modify that particular class because I am using it for many other controls.
  I know that I can copy those properties and create another class and use it for this particular anchor tag.</p>
  
  <p>Instead , is there any way in which I can extend that class and add few more properties in my <code>&lt;style&gt;</code> tag in my page.</p>