echobind/ember-links-with-follower

.link-follower-parent {
  margin: 0;
  padding: 0;
  position: relative;
}

.link-follower-parent > * {
  display: inline-block;
  cursor: pointer;
}

.links-with-follower .link-follower {
  border-bottom: 2px solid black;
  position: absolute;
  bottom: 0;
  width: 0px;
  padding: 0 !important;
  margin: 0 !important;
  transition: transform 150ms ease-in, width 150ms ease-in;
  left: 0;
}