nvim/lua/catppuccino/core/integrations/bufferline.lua

local util = require("catppuccino.utils.util")

return {
    BufferLineFill = {bg = util.brighten(cpt.bg, 0.04)},
    BufferLineBackground = {fg = cpt.gray, bg = cpt.black},
    BufferLineBufferVisible = {fg = cpt.gray, bg = cpt.black},
    BufferLineBufferSelected = {fg = cpt.white, bg = cpt.bg},
    BufferLineTab = {fg = cpt.gray, bg = cpt.bg},
    BufferLineTabSelected = {fg = cpt.red, bg = cpt.blue},
    BufferLineTabClose = {fg = cpt.red, bg = cpt.black},
    BufferLineIndicatorSelected = {fg = cpt.bg, bg = cpt.bg},

	-- separators
    BufferLineSeparator = {fg = cpt.black, bg = cpt.black},
    BufferLineSeparatorVisible = {fg = cpt.black, bg = cpt.black},
    BufferLineSeparatorSelected = {fg = cpt.black, bg = cpt.black},

	-- close buttons
    BufferLineCloseButton = {fg = cpt.gray, bg = cpt.black},
    BufferLineCloseButtonVisible = {fg = cpt.gray, bg = cpt.black},
    BufferLineCloseButtonSelected = {fg = cpt.red, bg = cpt.bg},
}