.reading-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: rgba(139, 0, 0, 0.55);
    transform-origin: left center;
    transform: scaleX(0);
    z-index: 99999;
    pointer-events: none;
    will-change: transform;
}