Textarea width???

Textarea width???

I added textarea element in my page with this snippet

  1.         <div data-role="fieldcontain">
  2.             <textarea name="textarea" id="textarea"></textarea>
  3.         </div>

The Framework adds style automatically to the textarea element, and as i see in firebug now, my textarea only has 60% of the width of min-width-480px. How can i change the percentage to 95%?