diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..58966e9
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1750776420,
+        "narHash": "sha256-/CG+w0o0oJ5itVklOoLbdn2dGB0wbZVOoDm4np6w09A=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "30a61f056ac492e3b7cdcb69c1e6abdcf00e39cf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..3669f92
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,44 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+  outputs =
+    { self, nixpkgs, ... }:
+    let
+      supportedSystems = [
+        "aarch64-linux"
+        "x86_64-linux"
+        "aarch64-darwin"
+        "x86_64-darwin"
+      ];
+      forEachSupportedSystem =
+        f:
+        nixpkgs.lib.genAttrs supportedSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
+    in
+      {
+        packages = forEachSupportedSystem (
+          { pkgs }:
+          {
+            default = pkgs.stdenv.mkDerivation {
+              name = "custom-css";
+              src = ./.;
+              nativeBuildInputs = with pkgs; [
+                pkg-config
+              ];
+              buildInputs = with pkgs; [
+                emacs-pgtk gtk3
+              ];
+              installPhase = ''
+                mkdir -p $out/lib
+                cp *.so $out/lib/
+              '';
+            };
+          }
+        );
+      };
+}