JSFiddle - React, Tailwind, and code Playground

HTML

<div id="last-comments"><div class="line"><span>текст</span></div></div>

CSS

#last-comments .line {
position: relative;
 z-index: 1;
 overflow: hidden;
 text-align: center;
 color: #777;
}

#last-comments .line:before,
#last-comments .line:after {
 content: '';
 display: inline-block;
 width: 100%;
 height: 1px;
 background: #ccc;
 z-index: -1;
 position: relative;
 vertical-align: middle;
}
#last-comments .line:before {
 right: 15px;
 margin: 0 0 0 -100%;
}
#last-comments .line:after {
 left: 15px;
 margin: 0 -100% 0 0;
}