diff --git a/lib/editor/tiny/styles.css b/lib/editor/tiny/styles.css
index a7ca3205b23..bc92e592cc2 100644
--- a/lib/editor/tiny/styles.css
+++ b/lib/editor/tiny/styles.css
@@ -2,6 +2,11 @@
     z-index: 1000;
 }
 
+.jsenabled .tox-shadowhost.tox-fullscreen,
+.jsenabled .tox.tox-tinymce.tox-fullscreen {
+    z-index: 1050;
+}
+
 /**
  * These styles are required to ensure that icons loaded from Moodle are displayed correctly in TinyMCE.
  * The first selector targets the menu.