I can't believe i left out semicolons. Sadly it changed nothing though. But it's weird, as i continued to screw with it, i refreshed after some random change, and suddenly everything worked. Then i refreshed again and it went back to not working. No changes, just another refresh. And i do see my values in the live css in the inspector. That seems to indicate that reality as i perceive it is a lie and i'm likely the subject of an experiment that's being conducted by beings living in a reality that's outside the realm of my awareness or comprehension.

I added this to make the gap between posts smaller.

.my-3 {  
    margin-bottom: 0.2rem !important;
    margin-top: 0.2rem !important;
}

edit: For some reason this doesn't seem to work on some instances, not sure why.