diff --git a/.changeset/short-kings-compete.md b/.changeset/short-kings-compete.md
new file mode 100644
index 0000000000..c4e5276065
--- /dev/null
+++ b/.changeset/short-kings-compete.md
@@ -0,0 +1,5 @@
+---
+"@primer/css": patch
+---
+
+Increases z-index for .show-on-focus
diff --git a/src/utilities/visibility-display.scss b/src/utilities/visibility-display.scss
index 4146cea1c2..bdb504c86b 100644
--- a/src/utilities/visibility-display.scss
+++ b/src/utilities/visibility-display.scss
@@ -115,7 +115,7 @@
   clip: rect(1px, 1px, 1px, 1px);
 
   &:focus {
-    z-index: 20;
+    z-index: 999;
     width: auto;
     height: auto;
     clip: auto;