diff --git a/index.html b/index.html
index 986ef25..831df18 100644
--- a/index.html
+++ b/index.html
@@ -6,6 +6,7 @@
         <meta name="viewport" content="width=device-width, initial-scale=1.0">
         <title>Chatβeta*</title>
         <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/@picocss/pico@2/css/pico.min.css">
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.13.1/font/bootstrap-icons.min.css">
         <link rel="icon" type="image/svg+xml" href="cat.svg">
         <link rel="apple-touch-icon" sizes="240x240" href="thumbnail.png" />
         <meta name="apple-mobile-web-app-title" content="Chatβeta*" />
@@ -77,10 +78,6 @@ body > main {
     z-index: 10;
 }
 
-#bouton_reconnaissance_vocale:hover {
-    filter: brightness(1.2);
-}
-
 #bouton_envoyer {
     padding: 1rem;
 }
@@ -98,7 +95,7 @@ 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="secondary" style="display: none;" disabled>🔈</button>
+                <button id="bouton_synthese_vocale" type="button" class="secondary" style="display: none;" disabled><i class="bi bi-volume-off-fill"></i></button>
             </nav>
         </header>
         <main class="container" id="conversation">
@@ -108,9 +105,9 @@ body > main {
             <form id="formulaire" action="question.php" method="post" role="group">
                 <fieldset role="group">
                     <textarea id="question" name="question" placeholder="Ma question" required></textarea>
-                    <button id="bouton_reconnaissance_vocale" type="button" class="outline secondary" style="display: none;">🎙️</button>
+                    <button id="bouton_reconnaissance_vocale" type="button" class="outline secondary" style="display: none;"><i class="bi bi-mic-fill"></i></button>
                 </fieldset>
-                <button id="bouton_envoyer" type="submit">❔</button>
+                <button id="bouton_envoyer" type="submit"><i class="bi bi-send-fill"></i></button>
             </form>
         </footer>
         <dialog id="boite_synthese_vocale">
@@ -118,7 +115,7 @@ body > main {
                 <header>
                     <button id="bouton_fermer" aria-label="Close" rel="prev"></button>
                     <p>
-                        <strong>🔊 Synthèse vocale</strong>
+                        <strong><i class="bi bi-volume-up-fill"></i> Synthèse vocale</strong>
                     </p>
                 </header>
                 <form>
@@ -149,7 +146,6 @@ const bouton_annuler = document.getElementById('bouton_annuler');
 const bouton_ok = document.getElementById('bouton_ok');
 const footer = document.querySelector('footer');
 const langue = document.documentElement.lang;
-let voix = null;
 let utterance = null;
 
 question.onkeydown = function(e) {
@@ -235,7 +231,7 @@ function charger_voix() {
     }
 
     speechSynthesis.removeEventListener('voiceschanged', charger_voix);
-    
+
     utterance = new SpeechSynthesisUtterance();
     utterance.lang = langue;
     utterance.rate = 1;
@@ -249,7 +245,7 @@ function charger_voix() {
             select_voix.value = i;
             utterance.voice = voix;
             option.selected = true;
-            bouton_synthese_vocale.innerHTML = "🔊";
+            bouton_synthese_vocale.innerHTML = `<i class="bi bi-volume-up-fill"></i>`;
         }
     })
 
@@ -266,11 +262,11 @@ function charger_voix() {
             let voix = liste_voix[select_voix.value];
             utterance.voice = voix;
             window.localStorage.setItem('voix', voix.voiceURI);
-            bouton_synthese_vocale.innerHTML = "🔊";
+            bouton_synthese_vocale.innerHTML = `<i class="bi bi-volume-up-fill"></i>`;
         } else {
             utterance.voice = null;
             window.localStorage.removeItem('voix');
-            bouton_synthese_vocale.innerHTML = "🔈";
+            bouton_synthese_vocale.innerHTML = `<i class="bi bi-volume-off-fill"></i>`;
         }
     };
 }