diff --git a/Makefile b/Makefile
index 711e0f3..ec537e5 100644
--- a/Makefile
+++ b/Makefile
@@ -6,8 +6,8 @@ web/trees:
       --out-name "trees" \
       ${CARGO_TARGET_DIR}/wasm32-unknown-unknown/release/trees.wasm
 
-	cp trees.html ./dist/trees/index.html
-	cp trees.css ./dist/trees/trees.css
+	cp ./web/trees.html ./dist/trees/index.html
+	cp ./web/trees.css ./dist/trees/trees.css
 
 	rm -rf dist/trees/assets
 
diff --git a/flake.nix b/flake.nix
index 10818ac..808ef2b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -52,6 +52,8 @@
                 # wasm builder
                 wasm-bindgen-cli_0_2_100
                 simple-http-server
+                # Itch.io uploads
+                butler
               ];
             LD_LIBRARY_PATH = lib.makeLibraryPath [
                 alsa-lib
diff --git a/trees.css b/web/trees.css
similarity index 100%
rename from trees.css
rename to web/trees.css
diff --git a/trees.html b/web/trees.html
similarity index 100%
rename from trees.html
rename to web/trees.html