Hello Your Instagram & Facebook Images are different Heights & Widths.
Once you have made them the same size
take all the images out of the column (delete) & the 3 containers
Change the display setting of the column (in the position section design view) to flex = Row
No Wrap
Space Around
Center
Stretch
Then re-insert your images (block),,, adjust the widths (including Max width to suit your requirements for all images.
that should do you nicely centered horizontally/vertically
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Wayan
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