None of the dark options are working

[augustocdias]

How can I check what I'm doing wrong? None of the "dark" options from the plugin is working... All windows are looking the same.

Here's my config:

require'nvim-web-devicons'.setup { default = true }
require'onedark'.setup {
    transparent = true,
    darkSidebar = true,
    darkFloat = true,
    sidebars = { 'packer', 'terminal', 'toggleterm' }
}
require('gitsigns').setup({ signcolumn = false, numhl = true })

vim.o.termguicolors = true
vim.o.guicursor = 'n-v-c:block-Cursor/lCursor-blinkon0,i-ci:ver25-Cursor/lCursor,r-cr:hor20-Cursor/lCursor'
vim.o.guifont = 'FiraCode Nerd Font Mono:12'
vim.o.inccommand = 'nosplit'
vim.go.t_Co = '256'
vim.o.background = 'dark'
vim.g.base16colorspace = 256
vim.cmd('colorscheme onedark')

The print shows nvim-tree but it is not applying also neither to packer, nor to terminal windows.

[ful1e5]

set transparent mode to false