JSFiddle - React, Tailwind, and code Playground
HTML
<ul>
<li><h3>Mission</h3>
</li>
</ul>CSS
ul h3 {
font-size:1.2em;
font-family:arial;
border-bottom:1px solid #333;
padding-bottom:10px;
position:relative;
width:250px;
}
ul li {
list-style:none;
}
ul h3:after {
border-bottom:1px solid #ff4800;
bottom:-1px;
left:0px;
content:"";
position:absolute;
width:55px;
}