title: override a CSS class if two other classes are present
body: <p>I want to override a CSS class if two other CSS classes are present for a particular element.</p>
  
  <p>Eg:</p>
  
  <p><code>&lt;img class="class1 class2" /&gt;</code></p>
  
  <p>I want to override <code>class3</code> in this case.</p>
  
  <p>I my current implementation is something like below.</p>
  
  <pre><code>.class1.class2 { .class3 {padding-left: 1px}  }
  </code></pre>
  
  <p>But this approach does not seem to work!</p>