* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
.center{
  position: absolute;
  top: 45%;
  left: 45%;
  transform: translate(-50%,-50%);
}
a{
  font-size: 20px;
  font-family: arial;
  text-decoration: none;
  text-transform: uppercase;
  transform-style: preserve-3d;
  position: relative;
  transform: .5s;
}
a::before{
  content: attr(title);
  position: absolute;
  top: 0;
  left: 0;
  padding: 15px 40px;
  background: #fff;
  color: #000;
  border: 3px solid #000;
  transition: .5s;
  transform-origin: right;
  transform: translateX(-100%) rotateY(90deg);
}
a::after{
  content: attr(title);
  position: absolute;
  top: 0;
  left: 0;
  padding: 15px 40px;
  background: #000;
  color: #fff;
  border: 3px solid #000;
  transition: .5s;
  transform-origin: left;
  transform: translateX(0) rotateY(0deg);
}
a:hover::before{
  transform: translateX(0) rotateY(0deg);
}
a:hover::after{
  transform: translateX(100%) rotateY(90deg);
}