How to resize the image size shown in lity lightbox ?

[TMKFrench]

Hi all,

I use your plug in in my Interactive map.
When i click on marker i show a thumb of the image in the map popup, and when the user click on it open the full image on lity lb.
My question is, how can i resize (via css or argument) the image if i want it bigger/smaller than the original size ?

great job.