<div>
  <ul>
    <li>
      <a href="">first</a>
    </li>
    <li>
      <a href="">second</a>
    </li>
    <li>
      <a href="">third</a>
    </li>
  </ul>
</div>

ul {
  padding: 1rem 3rem;
  display: flex;
  align-items: center;
  position: relative;
  text-transform: uppercase;
  border-top: 2px solid grey;
  border-bottom: 2px solid grey;
  padding: 0;
}

a {
  text-decoration: none;
  color: black;
}
li {
  padding: 1rem 3rem;
  display: flex;
  align-items: center;
  position: relative;
  font-weight: 900;
  font-size: 1em;
  background: none;
  border: 0;
  cursor: pointer;
}

li:before {
  content: "";
  width: 2px;
  background: grey;
  height: 100%;
  left: 0;
  position: absolute;
  transform: skew(-20deg);
  top: 0;
  bottom: 0;
}
li:after {
  height: 2px;
  content: "";
  background: red;
  width: 0;
  position: absolute;
  transform: translateX(-50%);
  transition: width 0.7s;
  transition-timing-function: cubic-bezier(1, 0.65, 0, 2.31);
  left: 50%;
  margin-top: 1.25rem;
}
li:hover,
li:focus {
  outline: none;
}
li:hover:after,
li:focus:after {
  width: calc(100% - 100px);
}

li:first-child:before {
  background: transparent;
}

@media (max-width: 700px) {
  li {
    font-size: 10px;
    padding: 0 10px;
  }
}