title: How to add style or put a class in a php form_submit button
body: <p>I just want my button to look awesome but I don't know how to apply styles or to put class on a button like this <a href="http://i.stack.imgur.com/EFvzg.jpg" rel="nofollow">http://i.stack.imgur.com/EFvzg.jpg</a></p>
  
  <pre><code>&lt;?php echo form_submit('submit', 'Submit');?&gt;
  </code></pre>
  
  <p>I want to put this css properties to my button to make it look like this <a href="http://i.stack.imgur.com/JmFLI.jpg" rel="nofollow">http://i.stack.imgur.com/JmFLI.jpg</a>.. </p>
  
  <pre><code>.btnBack{
        background: #3498db;
        border: solid 1px;
        border-color: #3498db;
        background-image: -webkit-linear-gradient(top, #3498db, #2980b9);
        background-image: -moz-linear-gradient(top, #3498db, #2980b9);
        background-image: -ms-linear-gradient(top, #3498db, #2980b9);
        background-image: -o-linear-gradient(top, #3498db, #2980b9);
        background-image: linear-gradient(to bottom, #3498db, #2980b9);
        -webkit-border-radius: 5;
        -moz-border-radius: 5;
        border-radius: 5px;
        color: #ffffff;
        font-size: 15px;
        padding: 5px;
        width: 100px;
        text-decoration: none;
      vertical-align: middle;
      }
  </code></pre>
  
  <p>please teach me how to do it.. thanks</p>