diff --git a/app/styles/app.css b/app/styles/app.css
index be09c1aa2..2fda73523 100644
--- a/app/styles/app.css
+++ b/app/styles/app.css
@@ -132,6 +132,7 @@
 
 .diff-highlight .removed-line {
   background-color: rgba(255, 0, 0, 0.1);
+  user-select: none;
 }
 
 .dark .diff-highlight .removed-line {