title: How to blur(css) div without blur child element
body: <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.content {
    float: left;
    width: 100%;
    background-image: url('images/zwemmen.png');
    height: 501px;
    -webkit-filter: blur(3px);
    -moz-filter: blur(3px);
    -o-filter: blur(3px);
    -ms-filter: blur(3px);
    filter: blur(3px);
  }
  
  .opacity {
    background-color: rgba(5, 98, 127, 0.9);
    height: 100%;
    overflow: hidden;
  }
  
  .info {
    float: left;
    margin: 100px 0px 0px 30px;
    width: 410px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="content"&gt;
    &lt;div class="opacity"&gt;
      &lt;div class="image"&gt;
        &lt;img src="images/zwemmen.png" alt="" /&gt;
      &lt;/div&gt;
      &lt;div class="info"&gt;
        a div wih all sort of information
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>If I do not want to blur the button, what do I need to do?</p>