Checkbox and radio visuals not what I would expect with the Blitzer theme

If you go to the theme roller page here theme roller you will see that the radio buttons and checkbox buttons have a solid red background when unchecked, and when the radio button is selected it becomes a smaller red dot, and for the checkbox it is even worse where there is no visible checkmark, and only the corresponding text changes color. So, with the Blitzer theme it is difficult to visually tell if a checkbox or radio button is selected. I would expect that in their unchecked state, that the radio button and the checkbox button would have a white background or something similar so that the checked state would be more apparent.