{
  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";

  outputs =
    inputs:
    let
      system = "x86_64-linux";
      pkgs = import inputs.nixpkgs { inherit system; };
    in
    {
      devShells.${system}.default = pkgs.mkShell {
        packages = with pkgs; [
          (pkgs.writeShellApplication {
            name = "serve";

            runtimeInputs = with pkgs; [
              simple-http-server
              tailwindcss_3
            ];

            text = ''
              set -o monitor

              simple-http-server --index --nocache "$@" &
              PID_SERVER=$!

              tailwindcss --input input.css \
                --output tailwind.css \
                --watch &
              PID_TAILWIND=$!

              cleanup() {
                echo "Stopping processes..."

                kill "$PID_SERVER" "$PID_TAILWIND" 2>/dev/null || true
                wait "$PID_SERVER" "$PID_TAILWIND" 2>/dev/null || true
              }
              trap cleanup EXIT

              wait
            '';
          })
        ];
      };
    };
}