diff --git a/runtime/Dockerfile b/runtime/Dockerfile
index 77b8bdf..b8224b1 100644
--- a/runtime/Dockerfile
+++ b/runtime/Dockerfile
@@ -42,9 +42,22 @@ COPY common ./common
 COPY runtime ./runtime
 RUN UV_DEFAULT_INDEX="https://pypi.tuna.tsinghua.edu.cn/simple/" uv sync --frozen --no-dev --no-editable --package runtime
 
-RUN mkdir -p /root/.jupyter/custom /app/.venv/share/jupyter/custom
-RUN echo '#top-panel { display: none !important; height: 0 !important; }' > /root/.jupyter/custom/custom.css && \
-    cp /root/.jupyter/custom/custom.css /app/.venv/share/jupyter/custom/custom.css
+RUN mkdir -p /root/.jupyter/custom /app/.venv/share/jupyter/custom && \
+    cat << 'EOF' > /root/.jupyter/custom/custom.css
+#top-panel,
+#top-panel-wrapper {
+  display: none !important;
+  height: 0 !important;
+  min-height: 0 !important;
+  margin: 0 !important;
+  padding: 0 !important;
+  border: none !important;
+  position: absolute !important;
+  pointer-events: none !important;
+}
+EOF
+
+RUN cp /root/.jupyter/custom/custom.css /app/.venv/share/jupyter/custom/custom.css
 
 EXPOSE 8000
 CMD ["uv", "run", "--frozen", "--package", "runtime", "gunicorn", "--config", "runtime/gunicorn.conf.py", "runtime.main:app"]