diff --git a/src/app.html b/src/app.html
index 4d2beaf7fb3af6161ce6dec9fda30ce9a77c4924..dc990bb8a39b41ca6b5ce08bd4934378f01f381b 100644
--- a/src/app.html
+++ b/src/app.html
@@ -1,4 +1,4 @@
-<!DOCTYPE html>
+<!doctype html>
 <html lang="fr" prefix="og: https://ogp.me/ns#">
   <head>
     <meta charset="utf-8" />