.#{$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);
    }
}