www-gem

Ok. If I have interpreted your post correctly you want to not use the default colors for values not defined in your theme (i.e. defaulting to transparency).

I see two options to combine to your theme:

• replacing any default colors using the command above
• using the transparency plugin so any colors not defined in your theme will be transparent

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I have treesitter as well and didn’t do anything specific before adding these lines to my config. If you’re looking to change “everything” without tweaking each highlight parameter individually you may be interested in this plugin.

This is my neovim visual config:

    -- General colors
    vim.api.nvim_set_hl( 0, "Normal", { bg = "none" } )
    vim.api.nvim_set_hl( 0, "NormalFloat", { bg = "none" } )
    vim.api.nvim_set_hl( 0, "NormalNC", { bg = "none" } )
    vim.api.nvim_set_hl( 0, "LineNr", { bg = "none" } )
    vim.api.nvim_set_hl( 0, "SignColumn", { bg = "none" } )
    vim.api.nvim_set_hl( 0, "Folded", { bg = "#4b4b4b" } )
    vim.api.nvim_set_hl( 0, "FoldColumn", { bg = "none" } )
    vim.api.nvim_set_hl( 0, "Visual", { fg = "#000000", bg = "#de935f" } )
    vim.api.nvim_set_hl( 0, "NotifyBackground", { bg = "#000000" } )```

    -- Spell checking 
    vim.api.nvim_set_hl( 0, "SpellLocal", { fg = default } )
    vim.api.nvim_set_hl( 0, "SpellRare", { fg = default } )
    vim.api.nvim_set_hl( 0, "SpellCap", { fg = "#de935f", italic=true } )
    vim.api.nvim_set_hl( 0, "SpellBad", { fg = "#ff0000", italic=true } )
   
   -- Markdown
   vim.api.nvim_set_hl( 0, "htmlBold", { bold=true } )
   vim.api.nvim_set_hl( 0, "htmlItalic", { italic=true } )
   vim.api.nvim_set_hl( 0, "htmlStrike", { fg = "#ff0000", strikethrough=true } )

vim.api.nvim_set_hl( 0, “Normal”, { bg = “none” } ) is probably what would work for you.