Code for reverse columns on mobile

Site URL: https://rayhantee.com/testimonials

Hi guys, would really appreciate some help with the coding for this. I've tried googling but it doesn't work for my site.

The 1st screenshot is how it looks like on desktop and I'd like the testimonials to be 

Photo

Text

Photo

Text

but now it shows up as

Photo

Text

Text

Photo

Could really use some help! Thank you so much

Add to Design > Custom CSS

/* Mobile photo text */
@media screen and (max-width:767px) {
div#page-section-61b897b62203a40a40a48396>.row {
    display: flex;
    flex-direction: column-reverse;
}
}