Issue with CocFloating or CocErrorFloat

[alonfnt]

I don't know enough about highlight to indentify where the problem is, but when a coc.nvim error appears, the letters can't be distinguished:

However, when I change colorscheme to default and change it back to github, they do work.

Steps to reproduce:

1. Have colorscheme github on the vimrc file.
2. Open a file and write a coc.nvim error. (text can't be read)
3. Change colorscheme: :colorscheme default
4. Change colorscheme again: :colorscheme github
5. Text can be read again.

Again, I am not sure if the issue is on the Github colors or some coc.nvim configuration.