JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <h3 class="block_header new_tab"><a href="/drugie-novosti/">Это интересно</a></h3>
</div>

CSS

.container {
  overflow: hidden;
  border-bottom: 2px solid #A01818;
  margin: 20px 15px 0 15px;
  height: 26px;
}

.block_header {
  color: #303030;
  font-size: 16px;
  font-family: "Roboto", sans-serif;
  font-weight: 700;
  line-height: 16px;
  margin: 0;
  text-align: right;
  text-transform: uppercase;
}

.new_tab:before {
  border-bottom: 26px solid #a01818;
  border-left: 32px solid transparent;
  content: '';
  display: inline-block;
  margin: 0 0 -6px 0; /* margin: 0 -4px -6px 0; - если теги <h3> и <a> будут с переносами */
}

.new_tab a {
  background: #a01818;
  color: #fff;
  display: inline-block;
  margin-top: 26px;
  padding: 7px 7px 3px 7px;
  text-decoration: none;
  transition: all 0.1s ease-in;
}

.container:hover a {
  transition: all 0.3s ease-out;
  margin-top: 0;
}