From 4251d7a8388cc7fda923c327db1860a814ff699f Mon Sep 17 00:00:00 2001
From: Michael Howell <michael@notriddle.com>
Date: Tue, 14 Sep 2021 10:05:35 -0700
Subject: [PATCH] Only switch to themes on buttons that have the `theme` class

Fixes #1649
---
 src/theme/book.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/theme/book.js b/src/theme/book.js
index 79d40354..d40440c7 100644
--- a/src/theme/book.js
+++ b/src/theme/book.js
@@ -371,7 +371,14 @@ function playground_text(playground) {
     });
 
     themePopup.addEventListener('click', function (e) {
-        var theme = e.target.id || e.target.parentElement.id;
+        var theme;
+        if (e.target.className === "theme") {
+            theme = e.target.id;
+        } else if (e.target.parentElement.className === "theme") {
+            theme = e.target.parentElement.id;
+        } else {
+            return;
+        }
         set_theme(theme);
     });