Vertical Divider Thickness / Environment Column Overflow Y

While looking at the component resizing PR, I noticed the space between the editor column and output is separated by a thick light gray area. I believe this is attributed to the overflow-y: scroll on the environment__column-contents rule. Taking it away seems to make the layout feel a bit cleaner and doesn't seem to make much of a difference in the scrolling experience as far as I can tell. Is there a reason for this rules existence that I am missing?

    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    overflow-x: hidden;
    **overflow-y: scroll;**
}```

Start by locating the .environment__column-contents rule and inspect how its overflow-y: scroll behavior affects the editor/output layout. Compare the layout and scrolling experience with that declaration removed, and confirm whether the thick divider and column overflow are resolved without regressing scrolling.