JSFiddle - React, Tailwind, and code Playground

HTML

<div id="h1back"><div id="h1txt">Наши работы</div></div>

CSS

#h1back {
    background: #000;
    width: 560px;
    height: 1px;
    margin-left: 22%;
    margin-top: 65px;
}
#h1txt {
    background: #fff;
    width: 120px;
    text-align: center;
    margin: 0 auto;
    height: auto;
}