Button hover animation using Html and Css only
  Please follow the below code and get started.
HTML Code
<body>
  <div class="container">
    <button class="btn">Sign up for Free</button>
  </div>
</body>
CSS Code
*, ::before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}
.btn {
  position: relative;
  background: #FBD148;
  border: 0;
  outline: 0;
  padding: 1rem 1.5rem;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: .25s ease;
}
.btn::before {
  position: absolute;
  content: '';
  transform: translate(-5px, -5px);
  width: 100%;
  height: 100%;
  border: 1px solid #000;
  transition: .25s ease;
}
.btn:hover {
  transform: translate(-5px, -5px);
}
.btn:hover::before {
  transform: translate(5px, 5px);
}Output
That is all! Thank you for visiting.
Code by - AltafAlam Shaikh
Topic covered - Transform property in Css
Technology used - Html, Css