:root { --px-per-ms: 0.1; } /* 100px per second */
body { background: #1a1a1a; color: white; font-family: sans-serif; }

.timeline-window {
    position: relative;
    width: 100%;
    height: 300px;
    overflow-x: auto;
    background: #222;
    border: 1px solid #444;
}

.track {
    position: relative;
    height: 50px;
    border-bottom: 1px solid #333;
    width: 5000px; /* Large width for scrolling */
}

.cue {
    position: absolute;
    height: 40px;
    top: 5px;
    background: #3498db;
    border-radius: 4px;
    padding: 5px;
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.2);
}

#playhead {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background: red;
    z-index: 10;
}

.controls { padding: 20px; }