JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html lang="en">

  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
  </head>

  <body>

    <button class="sign-button">
      sign up now
    </button>
    
 


  </body>

</html>

CSS

.sign-button {
  margin: 20px;
  padding: 1em;
  border: 0;
  color: white;
  border-radius: 0.5em;
  background: #57b;
  box-shadow: 0 0.2em 0.2em rgba(0, 0, 0, 0.15);

  /*所有属性变化都是使用过渡*/
  transition-property: all;
  /*过渡时间为0.5s*/
  transition-duration: 0.5s;
}


.sign-button:hover {
  background-color: purple;
  border-radius: 1em;
}

.sign-button:active {
  background-color: #148;
  transform: translateY(0.1em);
}