fix: footer overlap in sidebar

fern/custom.css

@@ -0,0 +1,20 @@
+/* Copyright (c) 2026, NVIDIA CORPORATION & AFFILIATES.  All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#fern-footer {
+    background-color: var(--background);
+    position: relative;
+    z-index: 10;
+}

fern/docs.yml

@@ -18,6 +18,7 @@ instances:
     multi-source: true
 title: NVIDIA AI Cluster Runtime
 global-theme: nvidia
+css: custom.css
 metadata:
   canonical-host: "docs.nvidia.com/aicr"
 products: