JSFiddle - React, Tailwind, and code Playground

HTML

<div class="txt">
    This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. This is just a temporary text. 
</div>

CSS

.txt {
    width:300px;
    height:48px;
    overflow:hidden;
    border-bottom-style:solid;
    border-bottom-width:1px;
    border-bottom-color:#aaaaaa;
    margin-bottom:2em;
    font-size:0.8em;
    line-height: 1.2;
}