#24918: fix CSS for code blocks when a side box is present.  Patch by Manvi B.
diff --git a/Doc/tools/static/basic.css b/Doc/tools/static/basic.css
index 42cb010..7230eb3 100644
--- a/Doc/tools/static/basic.css
+++ b/Doc/tools/static/basic.css
@@ -412,6 +412,11 @@
     background-color: transparent;
 }
 
+.highlight {
+    background: none !important;
+}
+
+
 /* -- math display ---------------------------------------------------------- */
 
 img.math {