JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="text">Текст текст</a>

CSS

.text {
  color: #fff;
  background-color: tomato;
  padding: 5px;
  position: relative;
  text-decoration: none;
}
.text::after {
  content: "";
  position: absolute;
  bottom: -1px; left: 0;
  background-color: tomato;
  width: 100vw;
  height: 1px;
}