feature: transparent border of floating window

[shy-robin]

Did you check the docs?

• I have read all the lazy.nvim docs

Is your feature request related to a problem? Please describe.

I have set ui.border = "rounded" , but I got this border style in the floating window:

Describe the solution you'd like

Is it possible to support transparent border like this ?

Describe alternatives you've considered

border highlight

Additional context

No response

[max397574]

this is just having the background of the border set to the same color as the normal background

[bezlant]

backdrop = 100 solves this ;)