Fix footer color and update node version used by workflow

.github/workflows/deploy.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 18.x
           cache: npm
 
       - name: Install dependencies

.github/workflows/test-deploy.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-node@v3
         with:
-          node-version: 16.x
+          node-version: 18.x
           cache: npm
 
       - name: Install dependencies

package.json

@@ -43,5 +43,8 @@
       "last 3 firefox version",
       "last 5 safari version"
     ]
+  },
+  "engines": {
+    "node": ">=18.0"
   }
 }

src/css/custom.css

@@ -26,3 +26,7 @@
   --ifm-color-primary-lightest: #4fddbf;
   --docusaurus-highlighted-code-line-bg: rgba(0, 0, 0, 0.3);
 }
+
+html[data-theme='dark'] footer {
+  background-color: #242526;
+}