header{border-bottom:1px solid #222;margin-bottom:1rem}footer{border-top:1px solid #222;margin-top:1rem}:root{font-size:1em}body{margin:0 auto;max-width:768px;font-family:serif}p{font-size:1.2rem;text-indent:1em}h1,h2,h3,h4,h5,h6{font-family:sans-serif}h1{font-size:4rem}h2{font-size:2.47rem}h3{font-size:2.12rem}h4{font-size:1.31rem}a{color:#00e;text-decoration:none}.text-display{font-size:6rem}