diff --git a/assets/warning-css.html b/assets/warning-css.html
new file mode 100644
index 0000000000..50f3b10f82
--- /dev/null
+++ b/assets/warning-css.html
@@ -0,0 +1,27 @@
+<style>
+  #tracing-warning-header {
+    z-index: 400;
+    position: fixed;
+    background-color: orange;
+    left: 0;
+    top: 0;
+    right: 0;
+    height: 50px;
+    display: block;
+    color: black;
+    font-size-adjust: 0.55;
+    line-height: 0.6;
+    padding-top: 10px;
+    padding-left: 230px;
+  }
+
+  body {
+    /* add top padding to fit the warning header */
+    padding-top: 50px !important;
+  }
+
+  .sidebar {
+    /* add top padding to fit the warning header */
+    margin-top: 50px !important;
+  }
+</style>
\ No newline at end of file
diff --git a/netlify.toml b/netlify.toml
index 6e3beff1a6..76794dd920 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -11,6 +11,9 @@
     --force-warn renamed-and-removed-lints \
     --cfg docsrs \
     --cfg tracing_unstable
+    --html-before-content /opt/build/repo/assets/warning.html \
+    --html-in-header /opt/build/repo/assets/noindex.html \
+    --html-in-header /opt/build/repo/assets/warning-css.html \
     """
   RUSTFLAGS="--cfg tracing_unstable"