diff --git a/_includes/topbar.html b/_includes/topbar.html
index 09bbc2085..735f1d1cf 100644
--- a/_includes/topbar.html
+++ b/_includes/topbar.html
@@ -1,6 +1,6 @@
 <!-- The Top Bar -->
 
-<header id="topbar-wrapper" aria-label="Top Bar">
+<header id="topbar-wrapper" class="flex-shrink-0" aria-label="Top Bar">
   <div
     id="topbar"
     class="d-flex align-items-center justify-content-between px-lg-3 h-100"