diff --git a/sass/custom/_layout.scss b/sass/custom/_layout.scss
index f9c18e8e4dd..acc24435d16 100644
--- a/sass/custom/_layout.scss
+++ b/sass/custom/_layout.scss
@@ -46,6 +46,7 @@ html {
 .site-header {
     position: fixed;
     width: 100%;
+    z-index: 999;
 }