diff --git a/web-app/src/containers/RenderMarkdown.tsx b/web-app/src/containers/RenderMarkdown.tsx
index 595e02352..7d90cbada 100644
--- a/web-app/src/containers/RenderMarkdown.tsx
+++ b/web-app/src/containers/RenderMarkdown.tsx
@@ -79,6 +79,16 @@ function RenderMarkdownComponent({
 
         return !isInline && !isUser ? (
           <div className="relative overflow-hidden border rounded-md border-main-view-fg/2">
+            <style>
+              {`
+              .react-syntax-highlighter-line-number {
+                user-select: none;
+                -webkit-user-select: none;
+                -moz-user-select: none;
+                -ms-user-select: none;
+              }
+            `}
+            </style>
             <div className="flex items-center justify-between px-4 py-2 bg-main-view/10">
               <span className="font-medium text-xs font-sans">
                 {getReadableLanguageName(language)}