How to retain rectangular border around button when clicked
===

When I select the vote button on this fiddle : http://jsfiddle.net/3Uz7S/4/

The vote image updates to an oval shape on firefox/chrome.

How can the css be updated so that when 'vote' is selected the button retains its rectangular shape or is this even possible ?

Fiddle code : 

    <script type="text/javascript" charset="utf-8" src="http://static.polldaddy.com/p/6343621.js"></script>
    
    .pds-vote-button {
        border-radius:0 !important;     
        -webkit-border-radius:0 !important; 
    }
    
    .pds-box {    
    border-radius:0 !important;     
    -webkit-border-radius:0 !important; 
    }