JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="tabs-nav">
  <li class="tabs-nav__item"><a href="#" class="tabs-nav__link">Саратов</a></li>
  <li class="tabs-nav__item"><a href="#" class="tabs-nav__link">Ульяновск</a></li>
  <li class="tabs-nav__item"><a href="#" class="tabs-nav__link">Красноярск</a></li>
</ul>

CSS

.tabs-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.tabs-nav__item {
  margin: 5px 0;
  overflow: hidden;
}

.tabs-nav__link {
  border: 1px solid #000;
  color: #000;
  display: inline-block;
  padding: 5px 10px;
  position: relative;
  text-decoration: none;
}

.tabs-nav__link:hover:after {
  background: #000;
  content: "";
  height: 1px;
  position: absolute;
  top: 50%;
  left: 100%;
  margin-top: -0.5px;
  width: 10000px;
  z-index: -1;
}