First page picures on different screen sizes

Hi
I really like the Morphology lite! The best I have found! Only have one problem.

I try to create such an amazing first page with 3×3 number of pictures. Worked good, the pictures are there. But…when I was changing to another computer with at bigger screen (15″) the pictures landed different. Two first rows with 4 pictures and last row with 2 pictures. Dosen´t look goood.

How do I fix this? Would like the same numbers of pictures on every row, even on different screen sizes.

(I´m from Sweden, so I apologize if my english isn´t so good. I hope you understand me anyway. 🙂 )