    .#{$prefix}form-radio {
        width: $form-radio-size;
        height: $form-radio-size;
        background: theme-background-image($form-radio-image) no-repeat;
    }

    .#{$prefix}form-cb-checked .#{$prefix}form-radio {
        background-position: 0 (0 - $form-radio-size);
    }

    .#{$prefix}form-radio-focus {
        background-position: (0 - $form-radio-size) 0;
    }
    .#{$prefix}form-cb-checked {
        .#{$prefix}form-radio-focus {
            background-position: (0 - $form-radio-size) (0 - $form-radio-size);
        }
    }