Row Wrapping 3 Column to 1 Column

Hello,

I am trying to adjust a row container. I have 1 row with 3 columns and would like for the 3 column to change directly to 1 column when the screen gets smaller. Currently it goes from 3 column to 2 column (tablet size) to and 1 column (mobile size).

Heres the link to the page. https://searchmeow-44ec37.easywp.com/. It is the 3 circles.
Questions:
1) How to change wrapping from 3 columns to 1 column
2) How to keep it centered on mobile (it is off center)

Thanks!