title: Fully transparent select option box
body: <p>In my template i have background image and form with select option box, I want to make whole select option box transparent so that user can see the background image in select option box also, I tried the below code but it is not working, Can any one guide me in right direction?</p>
  
  <p><em>Demo code</em></p>
  
  <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>body{
    color:#fff;
  }
    .content{
      min-height: 400px;
      background-image: url('http://www.planwallpaper.com/static/images/twe_background-1920x1080.jpg');
    }
  
  select{
    background-color:#000; 
    -moz-opacity:.40;
    opacity:.40;
  }
  
  select option{
    background-color: #000;
    filter:alpha(opacity=40);
    -moz-opacity:.40;
    opacity:.40;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/&gt;
  &lt;body&gt;
    &lt;div class="content"&gt;
      &lt;h1&gt;Content heading.&lt;/h1&gt;
      &lt;p&gt;Content body&lt;/p&gt;
  
      &lt;select class="form-control"&gt;
      &lt;option&gt;lorem lipsum&lt;/option&gt;
      &lt;option&gt;lorem lipsum&lt;/option&gt;
      &lt;option&gt;lorem lipsum&lt;/option&gt;
      &lt;option&gt;lorem lipsum&lt;/option&gt;
      &lt;option&gt;lorem lipsum&lt;/option&gt;
    &lt;/select&gt;
    &lt;/div&gt;
    &lt;/body&gt;</code></pre>
  </div>
  </div>
  </p>