Update index.html

index.html

@@ -1208,6 +1208,7 @@ window.addEventListener('load', async () => {
                     <button class="combine-button" id="apply-time-btn" disabled>時間設定を適用</button>
                 </div>
                 <h2>設定</h2>
+                <button class="combine-button" id="blank-mode-btn">消画モード: OFF</button>
                 <div class="setting-item">
                     <div class="global-volume-container">
                         <label>全体音量係数:</label>