Expand a field across the page

I have a form similar to this one - I'm trying to get the drop down box " Select a Sales Representative" to span across the page.  

Any suggestions?  https://form.jotform.com/60434211060135

Please inject the following CSS code: 

#id_28{

    width: 100% !important;

}

Result:

Open a new thread if you need anything else, we will be glad to assist you.

See this guide in order to inject the CSS code provided: http://www.jotform.com/help/117-How-to-Inject-Custom-CSS-Codes

Thank you very much!

On behalf of BDavid, you are welcome. Let us know if you need further help. Thank you.