JSFiddle - React, Tailwind, and code Playground

HTML

<li>
  <span>Жопа</span>
  <span>3м</span>
</li>

CSS

li {
  display: flex;
  justify-content: space-between;
  box-shadow: inset 0 -1px 0 0 black;
}

span {
  background: white;
}