how to add Radio Button color ?

how to add Radio Button color ?

here is the code:
  1. <fieldset data-role="controlgroup">
    <legend><strong>DIAGONAL INSTALLATION ?</strong></legend>
    <input type="radio" name="radiobutton" id="radio-choice-1" value="1" />
    <label for="radio-choice-1">Yes</label>
    <input type="radio" name="radiobutton" id="radio-choice-2" value="2" checked="checked" />
    <label for="radio-choice-2">No</label>
    </fieldset>