A Pen by Marcus Burnette.

Fancy-Button.markdown

Fancy Button

A Pen by Marcus Burnette on CodePen.

License.

index.html

<p>You know you want to hover over it.</p>
<a href="#">Fancy Button</a>

style.css

body {
  font-family: sans-serif;
  padding: 100px;
  text-align: center;
}

a {
  display: inline-block;
  padding: 1em 2em;
  border: 3px solid black;
  position: relative;
  overflow: hidden;
  transition: 0.3s;
  text-decoration: none;
  color: black;
}

a:after {
  content: '';
  position: absolute;
  top: 0%;
  left: 0%;
  width: 100%;
  height: 100%;
  background: black;
  transform: rotate(-20deg) scaleX(0) scaleY(3);
  z-index: -1;
  transition: 0.3s;
  opacity: 0;
}

a:hover {
  color: white;
}

a:hover:after {
  transform: rotate(-20deg) scaleX(1.1) scaleY(3);
  opacity: 1;
}