(This is a simple example where I work on a narrow screen to see the stacked results; you'll want to include media queries to determine when these extra rules take effect.)
As you can see in the main screenshot, the 4th grid cell is correctly shifted into the second position, as expected.
Yes, that's specifically the issue i was talking about; adding CSS class in the block settings was not working, it goes blank right after i was adding the CSS class.
But it just worked now when i reloaded the page.
Just something you might be aware of in case you encounter this.