feat: add ci to PR (#1)

.github/workflows/check.yml

@@ -0,0 +1,18 @@
+# https://docs.github.com/ja/pages/getting-started-with-github-pages/using-custom-workflows-with-github-pages
+name: Check
+
+on:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+      - run: npm ci
+      - run: npm run build

src/style.css

@@ -28,7 +28,7 @@ canvas {
   left: 4px;
   width: 24px;
   height: 24px;
-  color: white;
+  color: #e5e7eb;
   cursor: pointer;
 }