Bk-tooltip triangle

Hi,
I’m trying to customize tooltips background color. I’ve successfully changed box color by style .bk-tooltip, but I couldn’t figure out which style configures the pointing triangle color.

Could you tell me from which style tag can I change triangle color? Thanks for your attention.
image

Here’s the line that sets the color: bokeh/tooltips.less at 135e182df64394d96db782689fa4019f3fc9da58 · bokeh/bokeh · GitHub
Of course, it’s LESS and not CSS, but you should be able to find the right selectors from it.

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Appreciate it. It helped a lot!