.reading-progress{position:fixed;top:0;left:0;width:100%;height:4px;background:rgb(255 255 255 / .08);z-index:9999}.reading-progress__bar{width:0%;height:100%;background:#faaf3b;transition:width 0.1s linear}.demo-article{max-width:720px;margin:120px auto;padding:0 24px;line-height:1.7}.demo-article h1{margin-bottom:40px}.demo-article h2{margin-top:64px}