Create utils.lua file and add ToggleBackground command

config/nvim/init.lua

@@ -36,3 +36,5 @@ require("colorizer").setup()
 
 -- Automatically formatting buffer on save
 vim.api.nvim_command("autocmd BufWritePre * lua vim.lsp.buf.formatting_sync()")
+
+vim.cmd('command! ToggleBackground lua require("utils").toggleBackground()')

config/nvim/lua/utils.lua

@@ -0,0 +1,11 @@
+local M = {}
+
+M.toggleBackground = function ()
+  if vim.opt.background:get() == "dark" then
+    vim.opt.background = "light"
+  else
+    vim.opt.background = "dark"
+  end
+end
+
+return M