diff --git a/.github/workflows/demo.yml b/.github/workflows/demo.yml
index dd1bbe9..4d39040 100644
--- a/.github/workflows/demo.yml
+++ b/.github/workflows/demo.yml
@@ -1,5 +1,5 @@
-name: Check format, lint, and tests
-run-name: Fmt, lint, test
+name: Checks & deploy
+run-name: Fmt, lint, test, build, & deploy to gh-pages
 on: [push]
 jobs:
   fmt:
@@ -88,3 +88,58 @@ jobs:
         run: yarn install --frozen-lockfile
       - name: Run tests
         run: yarn test
+  build:
+    runs-on: ubuntu-latest
+    needs: [fmt, lint, test]
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Install tools from asdf config
+        uses: ai/asdf-cache-action@v1
+      - name: Cache Clojure dependencies
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.m2/repository
+          # List all files containing dependencies:
+          key: cljdeps-${{ hashFiles('deps.edn') }}
+          restore-keys: cljdeps-
+      - name: Get yarn cache directory path
+        id: yarn-cache-dir-path
+        run: echo "dir=$(yarn cache dir)" >> $GITHUB_OUTPUT
+      - name: Cache yarn dependencies
+        uses: actions/cache@v3
+        id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+      - name: Install npm deps
+        run: yarn install --frozen-lockfile
+      - name: Build js
+        run: yarn build-cljs
+      - name: Build css
+        run: yarn build-css
+      - name: Upload assets
+        uses: actions/upload-artifact@v3
+        with:
+          name: output
+          path: public
+
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    permissions:
+      pages: write
+      id-token: write
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+      - run: ls
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2
diff --git a/test/signals/hv_test.cljs b/test/signals/hv_test.cljs
index 120f4af..e6da6d4 100644
--- a/test/signals/hv_test.cljs
+++ b/test/signals/hv_test.cljs
@@ -8,7 +8,7 @@
 (def no-hp {:main nil})
 (def light-hp0 {:main {:green :off
                        :red :on
-                        :yellow nil
+                       :yellow nil
                        :secondary-red nil
                        :sh1 nil
                        :zs1 nil