.animacao {
  position: relative;
  display: inline-block;
}

.animacao::after {
  content: "";
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -6px;
  left: 0;
  background-color: #9333ea;
  transition: width 0.25s ease;
}

.animacao:hover::after {
  width: 100%;
}