Column Order xs

Hello, I have two columns and would like to have the left column underneath the right column on xs and sm screen size. I was able to set the sm column order to 1 and it appears under the right column. What can I do to change the column order on xs screens?

Thank You

P.S. I was using the Options panel to do this. There is an option for SM, MD, LG & XL
Can the developer put on in for XS

Answered my own question, encase someone wants to know.

@media (min-width: 300px) {
  #happycolumn-left {
    order: 1;