Align thumbnails in gallery

Hi,

I am testing this great plugin and this is 1 option I can't seem to find.

In your demo "Beispielgalerie 7" on the page below:
joomla15.kubik-rubik.eu/simple-image-gallery-extended

There are vertical and horizontal images, the vertical image seem to align left which causes a bigger empty space on the right of these images.
Is there a way for every thumbnails to align center?

thanks in advance for your time!

grtz,
W.

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