p {
  position: relative;
}
p:before, p:after {
  content: "";
  position: absolute;
  bottom: -3px;
  width: 0px;
  height: 1px;
  margin: 5px 0 0;
  transition: width 2s linear;
  -webkit-transition: width 2s linear;
  transition-duration: 2s;
  -webkit-transition-duration: 2s;
}
p.hover-1:after {
  left: 0;
  background-color: #ffffff;
}
p.hover-2:after {
  right: 0;
  background-color: #ffffff;
}
p.hover-3:before {
  left: calc(50%);
  background-color: #ffffff;
}
p.hover-3:after {
  right: calc(50%);
  background-color: #ffffff;
}
p.hover-4:before {
  left: 0;
  background-color: #ffffff;
}
p.hover-4:after {
  right: 0;
  background-color: #ffffff;
}
div.anim-underline:hover {
  cursor: pointer;
}
div.anim-underline:hover p:before, div.anim-underline:hover p:after {
  width: 100%;
  opacity: 1;
}
div.anim-underline:hover p.hover-3:before, div.anim-underline:hover p.hover-3:after, div.anim-underline:hover p.hover-4:before, div.anim-underline:hover p.hover-4:after {
  width: 50%;
}