Containers overlapping

In the site below, I’ve created a footer with 3 columns. The expectation was that these containers fill the spaces evenly in the footer instead of overlapping. Could you help me understand which settings we missed?

Hello There,

Thanks for writing in! To resolve your issue, please edit the footer and make sure to change the self flex option of the containers.

For your middle container, please set a maximum width so that it will not overlap with other containers.

Hope this helps. Kindly let us know.