Update

index.html

@@ -66,6 +66,22 @@
             pointer-events: none;
         }
 
+        #fullscreen-btn {
+            position: fixed;
+            bottom: 20px; right: 20px;
+            z-index: 999;
+            background: rgba(255,255,255,0.08);
+            border: 1px solid rgba(255,255,255,0.15);
+            color: rgba(255,255,255,0.4);
+            border-radius: 8px;
+            padding: 6px 10px;
+            font-size: 1.2rem;
+            cursor: pointer;
+            opacity: 0;
+            transition: opacity 0.3s;
+        }
+        #view-display:hover #fullscreen-btn { opacity: 1; }
+        #fullscreen-btn:hover { background: rgba(255,255,255,0.18); color: white; }
         .display-header {
             position: absolute;
             top: 32px; left: 40px;
@@ -1031,6 +1047,7 @@
      DISPLAY VIEW (Monitor 2)
 ============================================================ -->
 <div id="view-display" class="view">
+    <button id="fullscreen-btn" onclick="toggleFullscreen()" title="Vollbild">⛶</button>
     <div class="display-header">
         <img class="bni-badge" src="logo.jpeg" alt="BNI Sonne Ulm">
         <div class="chapter-name">Vorstellungsrunde</div>
@@ -1112,7 +1129,7 @@
         <span class="next-bar-end-text">Das war die letzte Vorstellung – Danke!</span>
     </div>
 
-    <div style="position:fixed;bottom:14px;right:20px;display:flex;align-items:center;gap:8px;opacity:0.35;pointer-events:none;">
+    <div style="position:fixed;bottom:14px;right:80px;display:flex;align-items:center;gap:8px;opacity:0.35;pointer-events:none;">
         <span style="color:white;font-size:0.7rem;letter-spacing:1px;text-transform:uppercase;">powered by</span>
         <img src="digiseed.png" alt="Digiseed" style="height:28px;width:auto;border-radius:4px;">
     </div>
@@ -3524,6 +3541,19 @@ function editMemberTimer(memberId) {
     renderControl();
 }
 
+function toggleFullscreen() {
+    if (!document.fullscreenElement) {
+        document.documentElement.requestFullscreen().catch(() => {});
+    } else {
+        document.exitFullscreen().catch(() => {});
+    }
+}
+
+document.addEventListener('fullscreenchange', () => {
+    const btn = document.getElementById('fullscreen-btn');
+    if (btn) btn.textContent = document.fullscreenElement ? '✕' : '⛶';
+});
+
 function editDefaultTimer() {
     const current = state.defaultTimer || 60;
     const answer  = prompt(