diff --git a/docs/public/code.css b/docs/public/code.css
index 3fbb266269..3548519701 100644
--- a/docs/public/code.css
+++ b/docs/public/code.css
@@ -4,6 +4,10 @@
   color: #fd9170;
 }
 
+.language-diff .token.prefix.deleted,.language-diff .token.prefix.inserted {
+  user-select: none
+}
+
 [class*='language-'] .namespace {
   opacity: 0.7;
 }