<ul class="menu">
  <li>
    <a href="#0">
      About
    </a>
  </li>
  <li>
    <a href="#0">
      Projects
    </a>
  </li>
  <li>
    <a href="#0">
      Clients
    </a>
  </li>
  <li>
    <a href="#0">
      Contact
    </a>
  </li>
</ul>
<hr>
<ul class="menu" data-animation="to-left">
  <li>
    <a href="#0">
      About
    </a>
  </li>
  <li>
    <a href="#0">
      Projects
    </a>
  </li>
  <li>
    <a href="#0">
      Clients
    </a>
  </li>
  <li>
    <a href="#0">
      Contact
    </a>
  </li>
</ul>
<hr>
<ul class="menu" data-animation="center">
  <li>
    <a href="#0">
      About
    </a>
  </li>
  <li>
    <a href="#0">
      Projects
    </a>
  </li>
  <li>
    <a href="#0">
      Clients
    </a>
  </li>
  <li>
    <a href="#0">
      Contact
    </a>
  </li>
</ul>
<hr>
<ul class="menu" data-animation="bonus">
  <li>
    <a href="#0">
      About
    </a>
  </li>
  <li>
    <a href="#0">
      Projects
    </a>
  </li>
  <li>
    <a href="#0">
      Clients
    </a>
  </li>
  <li>
    <a href="#0">
      Contact
    </a>
  </li>
</ul>
<footer class="page-footer">
  <small>Made with <span>❤</span> by <a href="http://georgemartsoukos.com/" target="_blank">George Martsoukos</a>
  </small>
</footer>

:root {
  --body-bg-color: #1a1c1d;
  --text-color: #aaaebc;
  --hr-color: #26292a;
  --red: #e74c3c;
}

ul {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

body {
  margin: 30px 0;
  font: 22px sans-serif;
  background: var(--body-bg-color);
  color: var(--text-color);
}

hr {
  border-color: var(--hr-color);
  margin: 20px 0;
}

.menu {
  display: flex;
  justify-content: center;
}

.menu li {
  margin-right: 70px;
}

.menu a {
  position: relative;
  display: block;
  padding: 5px;
}

.menu a::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, #b47dcd, #e878a2, #eb85ab);
  z-index: 1;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease-in-out;
}

.menu a:hover::before {
  transform: scaleX(1);
}


/* ANIMATIONS
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.menu[data-animation="to-left"] a::before {
  transform-origin: right;
}

.menu[data-animation="center"] a::before {
  transform-origin: center;
}

.menu[data-animation="bonus"] a::before {
  transform-origin: right;
}

.menu[data-animation="bonus"] a:hover::before {
  transform-origin: left;
  transform: scaleX(1);
  transition-timing-function: cubic-bezier(0.2, 1, 0.82, 0.94);
}


/* FOOTER
–––––––––––––––––––––––––––––––––––––––––––––––––– */
.page-footer {
  position: absolute;
  bottom: 10px;
  right: 10px;
  font-size: 1rem;
}

.page-footer span {
  color: var(--red);
}