diff --git a/src/theme/book.js b/src/theme/book.js
index aea7eda7..c0cd58e4 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -380,7 +380,7 @@ function playpen_text(playpen) {
 
     themePopup.addEventListener('focusout', function(e) {
         // e.relatedTarget is null in Safari and Firefox on macOS (see workaround below)
-        if (!!e.relatedTarget && !themePopup.contains(e.relatedTarget)) {
+        if (!!e.relatedTarget && !themeToggleButton.contains(e.relatedTarget) && !themePopup.contains(e.relatedTarget)) {
             hideThemes();
         }
     });