#rp-reading-progress-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: rgba(0, 0, 0, 0.08);
    z-index: 10000;
}

#rp-reading-progress-bar {
    width: 0%;
    height: 100%;
    background: linear-gradient(to right, #000000, #313131);
    transform-origin: left center;
    transition: width 0.05s linear;
}