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Help me fill the empty space! GRIDBOX

I’ll explain this in the most easy way I can.

I have a cms-list as a grid. The grid has 2 columns and 2 rows. Whenever the object in the left column, top row - is taller then the object in the right column, top row, the object in the right column, row 2 is pushed down. How can i move it up so the content is filled in the first empty space? I know this might be possible with flexboxes but what are my options?

Please see picture attached where the blue box is meant to visualize the object in the right column, second row that I want to push up (see arrow).

Thank you!

Kindly bumping this. Kind of suprised that no one has yet replied. Anyone?