JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="bloco">
    <div class="botao">
      <a href="">Saiba Mais</a>
    </div>
  </div>
</div>

CSS

.container {
  width: 400px;
  height: 200px;
  background: red;
  padding: 10px; 10px;
}

.container .bloco {
  width: 50%;
  height: 100px;
  margin-top: 15%;
  margin-left: 25%;
  background: yellow;
  position: relative;
  transition: 0.2s linear;
}

.container .bloco .botao{
  opacity: 0;
  transition: 0.2s linear;
}

.container .bloco .botao a {
  text-decoration: none;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  display: block;
  background: green;
  padding: 5px 10px;
  color: #fff;
  border-radius: 5px;
}

.container .bloco:hover {
  margin-left: 0;
  margin-top: 0;
  height: 200px;
  width: 400px;
}

.container .bloco:hover .botao {
  opacity: 1;
}