Radio button does not fill

Hello

Hello here as you can see the radio button has no fill – It looks like CSS conflict. Drop me please exact link to issue. Normal – http://clip2net.com/s/3EyEqgd

Also can i change the image of the radio button to custom and where can i edit it? – in file radio.php Example Read this please – http://stackoverflow.com/questions/5112995/how-to-replace-replace-radio-buttons-with-images OR http://code.stephenmorley.org/html-and-css/styling-checkboxes-and-radio-buttons/