title: What is the backslash in a CSS classname
body: <p>Im using a template for a website that has some pretty complex CSS.</p>
  
  <pre><code>.container.\31 25\25 {
      width: 100%;
      max-width: 1200px;
      min-width: 960px;
  }
  </code></pre>
  
  <p>What is ".\31 25\25" after the container class? There are many other version of the container class that contains different numbers.</p>