please refer to this screenshot https://prnt.sc/10jqcut that shows a bug with the text tooltip when I want to choose the background color of the text that is place to the extreme left
Let me know, if I am missing something or didn't understood your point.
But on my setup this is what it show: https://prnt.sc/10kehto
Hello Diana, select a word on the right and try to change the background color of the text as I did on the screenshot
This can't be resolved vis custom css
Adding it in trello
https://trello.com/c/ZxBgfyHe/