JSFiddle - React, Tailwind, and code Playground

HTML

<h1>Title Here</h1>
<div class="divA"></div>
<div class="divB"></div>

CSS

h1{
    font-size: 50px;
    font-weight: 700;
}
.divA{
    height: 1px;
    border-bottom: 2px solid black;
}
.divB{
    height: 1px;
    border-bottom: 1px solid black;
}