diff --git a/assets/lib/pace/pace-patch-flat-top.css b/assets/lib/pace/pace-patch-flat-top.css
new file mode 100644
index 00000000..0d762e5f
--- /dev/null
+++ b/assets/lib/pace/pace-patch-flat-top.css
@@ -0,0 +1,4 @@
+/* To patch pace theme flat-top z-index error */
+.pace {
+  z-index: 2000;
+}
\ No newline at end of file
diff --git a/layouts/partials/assets.html b/layouts/partials/assets.html
index 54afc38f..9018b63c 100644
--- a/layouts/partials/assets.html
+++ b/layouts/partials/assets.html
@@ -267,6 +267,10 @@
   {{- end -}}
   {{- dict "Source" $paceJS "Fingerprint" $fingerprint "Async" true "Defer" true | dict "Scratch" .Scratch "Data" | partial "scratch/script.html" -}}
   {{- dict "Source" $paceCSS "Fingerprint" $fingerprint | dict "Scratch" .Scratch "Data" | partial "scratch/style.html" -}}
+  {{- /* To patch pace theme flat-top z-index error */ -}}
+  {{- if eq $.Site.Params.pace.theme "flat-top" -}}
+    {{- dict "Source" "lib/pace/pace-patch-flat-top.css" "Fingerprint" $fingerprint | dict "Scratch" .Scratch "Data" | partial "scratch/style.html" -}}
+  {{- end -}}
 {{- end -}}
 
 {{- range $params.library.css -}}