diff --git a/index.html b/index.html
index b32a3fa..d3eac9e 100644
--- a/index.html
+++ b/index.html
@@ -14,7 +14,7 @@
         <meta property="og:locale" content="fr_FR" />
         <style>
 body {
-    --vph: "100dvh";
+    --vph: "100vh";
     display: flex;
     flex-direction: column;
     min-height: var(--vph);
@@ -68,7 +68,7 @@ body > main {
         <header>
             <nav class="container">
                 <h1>Chat<small><em>βeta</em><span style="color: #9B2318">*</span></small></h1>
-                <button id="bouton_synthese_vocale" type="button" class="outline" style="display: none;">🕨</button>
+                <button id="bouton_synthese_vocale" type="button" class="secondary style="display: none;">🕨</button>
             </nav>
         </header>
         <main class="container overflow-auto" id="conversation">
@@ -77,7 +77,7 @@ body > main {
         <footer class="container">
             <form id="formulaire" action="question.php" method="post" role="group">
                 <textarea id="question" name="question" placeholder="Ma question" required></textarea>
-                <button type="submit">Envoyer</button>
+                <button id="bouton_envoyer" type="submit">Envoyer</button>
             </form>
         </footer>
         <dialog id="boite_synthese_vocale">
@@ -85,7 +85,7 @@ body > main {
                 <header>
                     <button id="bouton_fermer" aria-label="Close" rel="prev"></button>
                     <p>
-                        <strong>🕨 Synthèse vocale</strong>
+                        <strong>🕪 Synthèse vocale</strong>
                     </p>
                 </header>
                 <form>
@@ -104,54 +104,68 @@ body > main {
         </dialog>
         <script>
             const formulaire = document.getElementById('formulaire');
-            const bouton = document.querySelector('button[type="submit"]');
+            const bouton_envoyer = document.getElementById('bouton_envoyer');
             const conversation = document.getElementById('conversation');
             const question = document.getElementById('question');
             const bouton_synthese_vocale = document.getElementById('bouton_synthese_vocale');
             const boite_synthese_vocale = document.getElementById('boite_synthese_vocale');
             const select_voix = document.getElementById('select_voix');
+            const aphone = select_voix.innerHTML;
             const bouton_fermer = document.getElementById('bouton_fermer');
             const bouton_annuler = document.getElementById('bouton_annuler');
             const bouton_ok = document.getElementById('bouton_ok');
             const footer = document.querySelector('footer');
-            const langue = "fr-FR";
+            const langue = document.documentElement.lang;
 
             let voix = null;
             if ('speechSynthesis' in window) {
-                let liste_voix = speechSynthesis.getVoices().filter(voice => voice.lang === langue);
-                liste_voix.forEach((v, i) => {
-                    const option = document.createElement('option');
-                    option.value = i;
-                    option.innerText = v.name;
-                    select_voix.appendChild(option);
-                    if (v.voiceURI === window.localStorage.getItem('voix')) {
-                        select_voix.value = i;
-                        voix = v;
-                        option.selected = true;
+                speechSynthesis.onvoiceschanged = function() {
+                    let liste_voix = speechSynthesis.getVoices().filter(voice => voice.lang.startsWith(langue));
+                    select_voix.innerHTML = aphone;
+                    
+                    if (!liste_voix.length) {
+                        bouton_synthese_vocale.style.display = 'none';
+                        return;
                     }
-                })
+                    
+                    liste_voix.forEach((v, i) => {
+                        const option = document.createElement('option');
+                        option.value = i;
+                        option.innerText = v.name;
+                        select_voix.appendChild(option);
+                        if (v.voiceURI === window.localStorage.getItem('voix')) {
+                            select_voix.value = i;
+                            voix = v;
+                            option.selected = true;
+                            bouton_synthese_vocale.innerHTML = "🕪";
+                        }
+                    })
                 
-                bouton_synthese_vocale.style.display = 'block';
-                bouton_synthese_vocale.addEventListener('click', () => {
-                    boite_synthese_vocale.showModal();
-                });
+                    bouton_synthese_vocale.style.display = 'block';
+                    bouton_synthese_vocale.addEventListener('click', () => {
+                        boite_synthese_vocale.showModal();
+                    });
+                    bouton_fermer.addEventListener('click', () => {
+                        boite_synthese_vocale.close();
+                    });
+                    bouton_annuler.addEventListener('click', () => {
+                        boite_synthese_vocale.close();
+                    });
+                    bouton_ok.addEventListener('click', () => {
+                        boite_synthese_vocale.close();
+                        if (select_voix.value) {
+                            voix = liste_voix[select_voix.value];
+                            window.localStorage.setItem('voix', voix.voiceURI);
+                            bouton_synthese_vocale.innerHTML = "🕪";
+                        } else {
+                            voix = null;
+                            window.localStorage.removeItem('voix');
+                            bouton_synthese_vocale.innerHTML = "🕨";
+                        }
+                    });
+                }
 
-                bouton_fermer.addEventListener('click', () => {
-                    boite_synthese_vocale.close();
-                });
-                bouton_annuler.addEventListener('click', () => {
-                    boite_synthese_vocale.close();
-                });
-                bouton_ok.addEventListener('click', () => {
-                    boite_synthese_vocale.close();
-                    if (select_voix.value) {
-                        voix = liste_voix[select_voix.value];
-                        window.localStorage.setItem('voix', voix.voiceURI);
-                    } else {
-                        voix = null;
-                        window.localStorage.removeItem('voix');
-                    }
-                });
+                speechSynthesis.onvoiceschanged()
             }
 
             question.addEventListener('keydown', e => {
@@ -167,10 +181,10 @@ body > main {
 
             formulaire.addEventListener('submit', async (e) => {
                 e.preventDefault();
-                if (bouton.disabled == true) return;
+                if (bouton_envoyer.disabled == true) return;
 
-                bouton.disabled = true;
-                bouton.setAttribute("aria-busy", true)
+                bouton_envoyer.disabled = true;
+                bouton_envoyer.setAttribute("aria-busy", true)
                 const formulaireData = new FormData(formulaire);
                 const citation = document.createElement('article');
                 citation.innerText = formulaireData.get('question');
@@ -211,8 +225,8 @@ body > main {
                 setTimeout(() => {
                     conversation.innerHTML += '<p class="reponse">Voulez-vous que je réponde à une autre question ?</p>';
                     conversation.scrollTop = conversation.scrollHeight;
-                    bouton.disabled = false;
-                    bouton.setAttribute("aria-busy", false);
+                    bouton_envoyer.disabled = false;
+                    bouton_envoyer.setAttribute("aria-busy", false);
                     question.focus()
                 }, t);
             })