Update index.html

index.html

@@ -2229,7 +2229,7 @@
                     timeMarkers.forEach(marker => {
                             const markerElement = document.createElement('div');
                             markerElement.className = 'time-marker';
-                            markerElement.textContent = `${marker.label}(${marker.time}秒)`;
+                            markerElement.textContent = `<b>${marker.label}</b>(${marker.time}秒)`;
                             markerElement.dataset.time = marker.time;
             
                             // ドラッグ開始