try shade.nvim

lazy-lock.json

@@ -26,6 +26,7 @@
   "playground": { "branch": "master", "commit": "ba48c6a62a280eefb7c85725b0915e021a1a0749" },
   "plenary.nvim": { "branch": "master", "commit": "2d9b06177a975543726ce5c73fca176cedbffe9d" },
   "rose-pine": { "branch": "main", "commit": "07a887a7bef4aacea8c7caebaf8cbf808cdc7a8e" },
+  "shade.nvim": { "branch": "master", "commit": "4286b5abc47d62d0c9ffb22a4f388b7bf2ac2461" },
   "smear-cursor.nvim": { "branch": "main", "commit": "051fe67e0081da273e07cd33ab8357d6b720f08f" },
   "telescope-bibtex.nvim": { "branch": "master", "commit": "289a6f86ebec06e8ae1590533b732b9981d84900" },
   "telescope-fzf-native.nvim": { "branch": "main", "commit": "cf48d4dfce44e0b9a2e19a008d6ec6ea6f01a83b" },

lua/custom/plugins/shade.lua

+return {
+  "sunjon/shade.nvim",
+  enabled = true,
+  config = function()
+    require "shade".setup({
+      overlay_opacity = 50,
+      opacity_step = 1,
+      keys = {
+        brightness_up   = "<C-Up>",
+        brightness_down = "<C-Down>",
+        toggle          = "<Leader>s",
+      }
+    })
+  end
+}