* {
  font-family: sans-serif;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background: #111;
}

a {
  position: relative;
  width: 160px;
  height: 50px;
  margin: 15px 10px;
  background: #222;
  text-decoration: none;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}
a::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: #00fe73;
  transition: 0.5s ease-in-out;
  transition-delay: 0.5s;
}
a::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  background: #00fe73;
  transition: 0.5s ease-in-out;
  transition-delay: 0.5s;
}
a:nth-child(2)::before,
a:nth-child(2)::after {
  background: #fe1a6f;
}
a:hover::before,
a:hover::after {
  width: 50%;
  transition-delay: 0s;
}
a span {
  position: absolute;
  z-index: 1;
  color: #fff;
  transition: 0.5s;
}

a span:nth-child(1) {
  transition-delay: 0.75s;
}

a:hover span:nth-child(1) {
  transform: scale(0);
  transition-delay: 0s;
}
a span:nth-child(2) {
  transform: scale(3);
  opacity: 0;
  color: #111;
  transition-delay: 0s;
}
a:hover span:nth-child(2) {
  transform: scale(1);
  opacity: 1;
  z-index: 10;
  transition-delay: 0.5s;
}