Pie chart labels hard to read

[mountainash]

When hovering on a light colour pie chat slice in light mode, the tooltip can be hard to read, as seen on the example site.

Dark slice colours are OK:

Can I suggest making the pie chart tooltips consistent with the other chart designs and then this is not a problem?

[mountainash]

The same problem also exists in dark mode.

[successbyte]

Hi,
assign the issue to me I will make a PR