JSFiddle - React, Tailwind, and code Playground

HTML

<p>hello</p>
<div id="line1"></div>
<div id="line2"></div>

CSS

#line1 { height: 0px; border-bottom: 1px solid blue }
#line2 { height: 10px; border-bottom: 2px solid red; -moz-box-shadow: 0 5px 10px #888; -webkit-box-shadow: 0 5px 10px #888 }