G6 creates canvas elements with style position: fixed #5031

Describe the bug

Hello,

There seems to be a problem in Beta 5 regarding the position of the canvas elements. They are being created with position: fixed, which makes their position fixed with regards to the screen. I think the correct would be position: absolute, which makes their position fixed with regards to the parent container. It ends up staying at a fixed place on the page instead of scrolling with the page. And I think something is wrong when detecting the container height too.

Your Example Website or App

https://zhcfkr.csb.app/

Steps to Reproduce the Bug or Issue

1. open https://zhcfkr.csb.app/
2. resize the window

Expected behavior

I would expect the canvas to scroll with the page

Screenshots or Videos

No response

Platform

• OS: Windows
• Browser: Chrome
• Version: 117.0.5938.63 64 bits

Additional context

No response