<a>
  <span class="gradient-text">👉 Click me 👈</span>
</a>

<link href="https://fonts.googleapis.com/css?family=Archivo+Black&display=swap" rel="stylesheet">

/* Tutorial on https://fossheim.io/writing/posts/css-text-gradient. */

.gradient-text {
  /* Fallback: Set a background color. */
  background-color: #6c36d8;
  
  /* Create the gradient. */
  background-image: linear-gradient(
    45deg,
    #0a4234 50%,
    #f2cfed 50%
  );
  
  /* Set the background size and repeat properties. */
  background-size: 270%;
  background-repeat: repeat;
  background-position: top right;

  /* Use the text as a mask for the background. */
  /* This will show the gradient as a text color rather than element bg. */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; 
  -moz-background-clip: text;
  -moz-text-fill-color: transparent;

  
  animation: button-animation 0.65s 0.15s ease-out forwards;
}

a:hover, a:hover span{
    animation: button-animation-rev 0.65s ease-out forwards;
}

a:hover {
  box-shadow: 3px 2px 10px 1px rgba(0,0,0,0.15);
  transition: 0.5s;
}

@keyframes button-animation {
  0% {
    background-position: top right;
  }
  100% {
    background-position: top left;
  }
}

@keyframes button-animation-rev {
  0% {
    background-position: top left;
  }
  100% {
    background-position: top right;
  }
}

/* Style the rest of the page. */
body {
  background-color: #fcfdfc;
}

a {
  margin-top: 1em;
  margin-top: calc(50vh - 3em);
  margin-left: auto;
  margin-right: auto;
  background-image: linear-gradient(45deg, #f2cfed 50%, #0a4234 50%);
  background-size: 270%;
  background-repeat: repeat;
  background-position: top right;
  animation: button-animation 0.65s 0.15s ease-out forwards;
  display: table;
  border-radius: 0.5em;
  text-decoration: none;
  box-shadow: 7px 4px 20px 1px rgba(0,0,0,0.15);
  padding: 1.5em 0;
  cursor: pointer;
}

a span {
  font-family: "Archivo Black", sans-serif;
  font-weight: normal;
  font-size: 2em;
  text-align: center;
  margin-bottom: 0;
  margin-bottom: -0.25em;
  width: 100%;
  padding: 0 1.5em;
}