Button

  <link href="https://cdnjs.cloudflare.com/ajax/libs/normalize/8.0.0/normalize.min.css" rel="stylesheet">

  <div class="card"> <!--Card for the button so the button doesn't have to be position absolute and put in a real setting-->
    <a href="#" class="container">
      <div class="action">Buy Now</div>
      <div class="price">For $9.99</div>
    </a>
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"  ></script> 

@import url("https://fonts.googleapis.com/css?family=Open+Sans");
body {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(35deg, #64B6AC, #3C6B7C 100%);
}
body .card {
  padding: 40px;
  border-radius: 4px;
  background-color: #FFFFFF;
}
body .card .container {
  position: relative;
  display: block;
  overflow: hidden;
  width: 170px;
  height: 50px;
  margin: 10px 55px;
  border: 2px solid #64B6AC;
  border-radius: 4px;
  color: #3C6B7C;
  background: transparent;
  font-family: "Open Sans", sans-serif;
  text-transform: uppercase;
  text-decoration: none;
  text-align: center;
  letter-spacing: 2px;
  line-height: 50px;
  transition: all 0.3s ease;
}
body .card .container > * {
  position: absolute;
  width: 100%;
  height: 50px;
}
body .card .container > *.price {
  bottom: 0;
  opacity: 0;
  transition: all 0.3s ease;
}
body .card .container:hover {
  width: 280px;
  height: 70px;
  margin: 0px 0px;
  /*
  .action {
    top:-2px;
  }
  .price {
    bottom:-2px;
  }/**/
}
body .card .container:hover .price {
  opacity: 1;
  transition: all 0.3s ease -0.15s;
}
body .card .container:active {
  color: #FFFFFF;
  background: #64B6AC;
  transition: all 0.3s ease -0.15s;
}