Making columns/code blocks have the same height

Site URL: https://platformer.nl/

I created 2 code blocks that are made out of divs with a background color (see attachment to see which 2 divs I mean). I'd like to have these 2 divs at the same height. I tried some tutorials but can't seem to get it right.

Thanks a lot!

Add to Design > Custom CSS

/* Same height */
@media screen and (min-width:768px) {
div#page-section-5f8fe30ef741391bbbfc22cc>.row {
    display: flex;
}
div#page-section-5f8fe30ef741391bbbfc22cc .span-5 {
    background: #6ccccc;
}
}