title: css style for selector <tr> with asp.net gridview
body: <p>I have a table generated with ASP.NET GridView, and I have to put some space between each <code>&lt;tr&gt;</code>.</p>
  
  <p>In my CSS file I have description for <code>&lt;tr&gt;</code> selector:</p>
  
  <pre><code>.tr {
      margin-bottom: 5px;
  }
  </code></pre>
  
  <p>But, using developer tools in browser, I've founded that style for <code>&lt;tr&gt;</code> is used not from my CSS file, but it has "user defined stylesheet" and I can't change <code>margin-bottom</code> even in browser developer tools.</p>
  
  <p>So, what is the problem?</p>