#reading-progress-bar{position:fixed;top:0;left:0;width:0%;height:4px;background:var(--primary);z-index:1000;transition:width .1s ease-out}#reading-progress-bar::after{content:'';position:absolute;right:0;height:100%;width:10px;box-shadow:0 0 10px var(--primary),0 0 5px var(--primary);opacity:.7}.dark #reading-progress-bar{background:var(--primary)}