title: How can I remove a property when using media queries?
body: <p>Without media queries I have something like this: </p>
  
  <pre><code> .sample_div {
        left: 200px;
   }
  </code></pre>
  
  <p>When I have a 780px media query, I want to do the following: </p>
  
  <pre><code> .sample_div {
        right: 300px;
   }
  </code></pre>
  
  <p>The problem is that the left is showing in the 780px media query.  How can I only show right and not left in that one? </p>