WordPress Shortcode to Add a Big Orange Button With a Link

orange-button.css

.orange-button {
   background: none repeat scroll 0 0 #FB661B;
   -moz-border-radius: 5px;
   -webkit-border-radius: 5px;
   border-radius: 5px;
   display: table;
   margin: 10px auto;
   padding: 3px 10px;
   text-align: center;
}

.orange-button a,
.orange-button a:hover,
.orange-button a:visited {
   color: #fff;
}

orange-button.php

function orange_button($atts, $content = null) {
   extract(shortcode_atts(array(
         'link' => 'http://handsonwordpress.com'
      ), $atts));
   return '<a class="orange-button" href="'.$link.'">' . $content . '</a>';
}
add_shortcode('button', 'orange_button');

orange-button.txt

Example of the use of this shortcode that uses the default link:

[button]Learn About Shortcodes[/button]

Using the shortcode with a specified link:

[button link="http://handsonwordpress.com/classes/wordpress-advanced/"]Learn About Shortcodes[/button]