<!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>CodeWebDao.com - Create button animation</title>
    <style>
        
    </style>
</head>
<body>
<a href="#">
    <span></span>
    <span></span>
    <span></span>
    <span></span>
    Button
</a>
</body>
</html>
a {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background-color: #000000;
  padding: 20px 40px;
  text-decoration: none;
  color: white;
  text-transform: uppercase;
  overflow: hidden;
  box-shadow: 0 1px 3px .4px #000000;
  transition: all 0.3s;
}

a:hover {
  box-shadow: 0 1px 7px .4px #000000;
  color: red;
}

/*TOP*/
a span:nth-child(1) {
  content: '';
  position: absolute;
  width: 100%;
  height: 3px;
  background: red linear-gradient(to right, black, red);
  top: 0;
  right: 0;
  animation: animationleft 2s linear 0.3s infinite;
}

/*Right*/
a span:nth-child(2) {
  content: '';
  position: absolute;
  width: 3px;
  height: 100%;
  background: red linear-gradient(to bottom, black, red);
  top: 0;
  right: 0;
  animation: animationdown 2s linear 0.3s infinite;
}

/*Bottom*/
a span:nth-child(3) {
  content: '';
  position: absolute;
  width: 100%;
  height: 3px;
  background: red linear-gradient(to left, black, red);
  bottom: 0;
  right: 0;
  animation: animationright 2s linear 0.3s infinite;
}

/*Left*/
a span:nth-child(4) {
  content: '';
  position: absolute;
  width: 3px;
  height: 100%;
  background: red linear-gradient(to top, black, red);
  top: 0;
  left: 0;
  animation: animationtop 2s linear 0.3s infinite;
}

@keyframes animationdown {
  from {
    transform: translateY(-100%);
  }
  to {
    transform: translateY(100%);
  }
}

@keyframes animationtop {
  from {
    transform: translateY(100%);
  }
  to {
    transform: translateY(-100%);
  }
}

@keyframes animationleft {
  from {
    transform: translateX(-100%);
  }
  to {
    transform: translateX(100%);
  }
}

@keyframes animationright {
  from {
    transform: translateX(100%);
  }
  to {
    transform: translateX(-100%);
  }
}

External CSS

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External JavaScript

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