Hi,
I use base16, and would want the statusbar to have same color, or to appear transparent. Now it has a dark tint to it. Tried to find anything related in the docs, or issue. But came up empty.

Using Tmuxline, and managed to remove the background. And would love to do the same with Vim :-)
Thank you for the plugin though :-)
How about this configuration?
let s:palette = g:lightline#colorscheme#{g:lightline.colorscheme}#palette
let s:palette.normal.middle = [ [ 'NONE', 'NONE', 'NONE', 'NONE' ] ]
let s:palette.inactive.middle = s:palette.normal.middle
let s:palette.tabline.middle = s:palette.normal.middle

You're the boss man! :-D Much appreciated!
I never thought I'd find an answer for this, thanks man.
I'm getting Undefined variable: g:lightline#colorscheme#wombat#palette
has anything changed or am I just missing something?
@jonmackenzie just tried to solve the same issue,
for me the combination of this code, and the one from https://github.com/itchyny/lightline.vim/issues/381#issuecomment-523529581 worked.
autocmd VimEnter * call SetupLightlineColors()
function SetupLightlineColors() abort
" transparent background in statusbar
let l:palette = lightline#palette()
let l:palette.normal.middle = [ [ 'NONE', 'NONE', 'NONE', 'NONE' ] ]
let l:palette.inactive.middle = l:palette.normal.middle
let l:palette.tabline.middle = l:palette.normal.middle
call lightline#colorscheme()
endfunction

even after putting the above block in my .vimrc, parts of the status line remain colored (specifically the grey parts)

Is there any way to make these parts transparent? I tried to set the grey color to same color as my background, but it produces this weird looking light blue instead, I assume it uses 16-colors instead of 256
Most helpful comment
How about this configuration?