black border around image lightbox

Hello developers!

My sincere compliments for your software, we have recently put online the the shop. I unfortunately have no knowledge of CSS, but try do do my best to get around tecnical problems so sorry for the questions: I do wish to say that i am satisfied of the component and realize that it is very sofisticated. For a few days i stared at V.M. but it was a total headache!! and also very ugly removed it forever!

I would like to do some tunings and was not able to find the adeguate information:

1) how do i reduce the border width of the image lightbox (when you actually click on an image to view)?
for instance if you click on the image here you will see the lightbox popup:

www.duealberi.com/shop/product/11-lorenz...-medici-flowers.html

I would like not to have it with such a thick black border: clients may think that the image is actually with a black border (yes!)
2) how do i set the overall height and width dimensiona of that popup lightbox images

3)(this question may seem wierd) Is there some setting that controls the contrast or saturation rendering of the displayed images in Hikashop?
We notice that in our blogger page the same image are around 15% more brilliant as also the same images displayed within the gallery in our web site.

Thank you in advance for your help!

Fabio
DueAlberi

Hi Nicolas,
Thanks a lot for your help
I will implement it in the CSS and check your suggestions.

Fabio