h1,h2,h3,h4{position:relative;margin-top:1.2em;font-weight:700}h1{margin-bottom:1.2em}h1::before{content:'';position:absolute;bottom:-1rem;left:0;height:4px;width:60px;background:#00000029}h3{font-size:1.4em}h4{font-size:1.2em}#main-content .container{max-width:900px}#references li{margin-bottom:1em}