Columns height

Hey dear WP family,

I have a question which some people have already asked in a similar fashion, but the solutions didn’t fit my case, so here’s my topic:

I’m using Shortcodes Ultimate to create columns on my site (see link attached). In those columns, I put su_boxes …no I have the issue that in my screen resolution, everything looks pretty and just like I want it to look, but as soon as I resize my browser window or change screen resolution, the boxes change sizes (due to font size) and are not equal anymore.

I tried the height: 100%; CSS for the su_box, but it does not work (although the px value works)…but I need it to work in percentages, as boxes are put on other pages, too, and the content is larger or smaller. I also tried to work on the su_columns with some CSS, but I could not achieve what I wanted to achieve (which is: the boxes should all hit the bottom of the su_row which is set by the largest box).

Can anyone tell me a workaround here? It’s impossible to use pixels for the CSS because this is wrong again as soon as I change resolution (or the page!).

Thanks in advance, I’m curiously awaiting your answers 🙂

Best wishes,
Dom

The page I need help with: [log in to see the link]