To me, a little but convenient feature would be to close the "Welcome to the Stack Exchange network chat" banner by clicking anywhere (like the Next Badge menu, which has an X but closes with a random click) when you visit the Stack Exchange network Chat. Currently, you have to click the "Click here to remove the notification bar" in the screenshot below:
which is kind of hard to see, as it's gray, and so is the banner.
It is a small thing, but I think it'd be fairly useful. Or if not that, maybe highlight the button in a brighter color to make it easier to see?
Or maybe, to prevent accidental one-click closure, you could double-click anywhere to close it, which would still be faster but completely intentional.
I await your opinions in the comments and answers below.