PF4: Popover and Tooltip need an extra CSS import

[msglifeIberia]

I followed the documentation and imported the @patternfly/react-core/dist/styles/base.css file in my app.
Later I used a <Popover> in my app and noticed it didn't behave like it does in your storybook.
The main issues were the positioning that was slightly off and the lack of the fading effect when showing the popover.
Inspecting the DOM and the CSS imports I found out I was missing this CSS file import:
tippy.js/dist/tippy.css

I wasn't able to find any reference to this import in your documentation.
This import should be done within the base.css or the documentation should have a note saying that this import is needed if one wants to use the <Popover> or the <Tooltip> components (and maybe other components that use tippy.js as well?).