https://codepen.io/danielschmitz/pen/MWgpjNN
What is the behavior you expect?
tooltip color and bar color are same, when fill.colors are set
What is happening instead?
tooltip colors still using pallete color, over the fill property
What error message are you getting?
no errors
Image:

If you want to have universal colors for everything, you need to define the main colors property like this
options = {
colors: ['#aa0000']
}
Most helpful comment
If you want to have universal colors for everything, you need to define the main
colorsproperty like this