diff --git a/truthseeker/templates/lobby.html b/truthseeker/templates/lobby.html
index 2e317d1..69de002 100644
--- a/truthseeker/templates/lobby.html
+++ b/truthseeker/templates/lobby.html
@@ -11,14 +11,14 @@
         <div class="join_room_view hidden">
             <h1 class="room_title">Salon</h1>
             <input type="text" id="game_username" placeholder="Entrez un pseudo" value="" required="required" maxlength="20">
-            <button class="action_button" id="join_game_button">Rejoindre</button>
+            <button id="join_game_button" class="action_button">Rejoindre</button>
             <p class="game_start_failed hidden">Une erreur s'est produite. Réessayez ultérieurement.</p>
         </div>
         <div class="room_view hidden">
             <div class="room_view_container">
                 <h1 class="room_title">Salon</h1>
                 <div class="room_code_text hidden">
-                    <h3 class="room_code_text_title">Code&nbsp;: <span class="room_code"></span></h3>
+                    <h3 class="room_code_text_title">Code&nbsp;: <a href="" class="room_code"></a></h3>
                     <button id="invite_friends_button" class="action_button">Inviter vos amis</button>
                 </div>
             </div>
@@ -30,15 +30,16 @@
                 <div class="multi_player_mode_choices hidden">
                     <div class="multi_player_mode_choice">
                         <h3 class="multi_player_mode_choice_title">Jouer au mode Histoire</h3>
-                        <button class="action_button">Lancer</button>
+                        <button id="multi_player_history_start_button" class="action_button">Lancer</button>
                     </div>
                     <div class="multi_player_mode_choice">
                         <h3 class="multi_player_mode_choice_title">Jouer au mode Challenge</h3>
-                        <button class="action_button">Lancer</button>
+                        <button id="multi_player_challenge_start_button" class="action_button">Lancer</button>
                         <div class="multi_player_mode_choice_number">
                             <h3 class="rounds_count_title">Nombre de tours&nbsp;:</h3>
                             <input id="rounds_count" type="number" min="5" max="15" value="5">
                         </div>
+                        <p class="multi_player_challenge_mode_invalid_input hidden">Nombre de tours invalide. Veuillez entrer un nombre valide entre 5 inclus et 15 inclus.</p>
                     </div>
                 </div>
                 <h3 class="multi_player_mode_waiting_for_host hidden">En attente du démarrage de la partie par l'hôte&nbsp;…</h3>