I have some issues with the contours of the preview window of coq_nvim

The same issue happens with symbols-outline.nvim

I have the same issue with the color schemes rusticated and base16-seti, so I suppose the issue is related to the neovim part rather than the vim part.
Thanks in advance !
PS : I love this color scheme, thanks a lot for making it
I have some issues with the contours of the preview window of
coq_nvimThe same issue happens with
symbols-outline.nvimI have the same issue with the color schemes
rusticatedandbase16-seti, so I suppose the issue is related to theneovimpart rather than thevimpart.Thanks in advance !
PS : I love this color scheme, thanks a lot for making it