JSFiddle - React, Tailwind, and code Playground

HTML

<h2>Наши преимущества</h2>

CSS

h2 {
  position:relative;
  display: inline-block;
}
h2::before {
  content: "";
  position: absolute;
  width: 80%;
  height: 2px;
  background: blue;
  left: 10%;
  bottom: -5px;
}
h2::after {
  content: "";
  position: absolute;
  width: 50%;
  height: 2px;
  background: blue;
  left: 25%;
  bottom: -10px;
}