Multiple choice widget: Changing the color of check box background and border

Using the mulitple choice or checkbox element give me a box field the same color as the form and a box outline of an odd color.  How do I make the box field and outline the same color as all my other answer fields, i.e. white with black boarder.

Thank you

Please inject this custom CSS code:

.form-checkbox-item:not(#foo) label:before {
  background-color: #ffffff;
   border: 2px solid #000000;
}

Here's a guide on How-to-Inject-Custom-CSS-Codes. Here's the result:

Hope that helps. Thank you.