make lightbox properly display whole picture without cutting of parts when the...

make lightbox properly display whole picture without cutting of parts when the picture is very wide.

style.css

@@ -534,6 +534,7 @@ div#extras_scale_to_tab div.form{
 #lightboxModal > img.modalImageFullscreen{
     object-fit: contain;
     height: 100%;
+    width: 100%;
     min-height: 0;
 }