Fix gruvbox theme

[penso]

I'm using ellisonleao/gruvbox.nvim and wonder how I could get the active tab to be the same light background color as the one I have at the bottom right of my lualine. Any pointer?

[penso]

I was able to get it right using the following:

local theme = {
  fill = 'TabLineFill',       -- tabline background
  head = 'TabLine',           -- head element highlight
  current_tab = 'PmenuThumb', -- <- using this instead of `TabLineSel`
  tab = 'TabLine',            -- other tab label highlight
  win = 'TabLine',            -- window highlight
  tail = 'TabLine',           -- tail element highlight
  main = 'PmenuSel',
}