diff --git a/jekyll_theme/assets/css/older-tomato.css b/jekyll_theme/assets/css/older-tomato.css
index 40798ef..4d5d6d8 100644
--- a/jekyll_theme/assets/css/older-tomato.css
+++ b/jekyll_theme/assets/css/older-tomato.css
@@ -28,6 +28,7 @@ p a:hover {
 
 h2 a, h3 a {
   display: none;
+  user-select: none;
 }
 
 h2:hover a, h3:hover a {