diff --git a/static/css/cours.css b/static/css/cours.css
index 20ca6d1..32a49b6 100644
--- a/static/css/cours.css
+++ b/static/css/cours.css
@@ -57,7 +57,7 @@ main img {
   max-width: 100%;
 }
 
-button.menu {
+button#menu {
   display: none;
 }
 
@@ -74,7 +74,7 @@ input[type="text"] {
     margin-left: unset;
   }
 
-  button {
+  button#menu {
     width: 100%;
     display: block;
 
diff --git a/static/js/cours.js b/static/js/cours.js
index 5b6f539..d12ac4e 100644
--- a/static/js/cours.js
+++ b/static/js/cours.js
@@ -148,7 +148,7 @@ window.addEventListener("load", () => {
 
   // Responsive menu
   let menuOpen = false;
-  const button = document.getElementsByTagName("button.menu")[0];
+  const button = document.getElementById("menu");
   const content = document.getElementsByTagName("main")[0];
   const initialButtonTextContent = button.textContent;
   const resetPage = () => {