progress-bar.css

.scroll-progress-bar-container {
    position: fixed;
    left: 0;
    width: 100%;
    z-index: 10000;

    transition: transform 200ms, -webkit-transform 200ms;
}

.scroll-progress-bar-bottom {
    bottom: 0;
}

.scroll-progress-bar-top {
    top: 0;
}

.scroll-progress-bar-bar {
    width: 100%;
    -webkit-transform: translateX(-100%);
    transform: translateX(-100%);
	transition: 0.1s ease-out;
}