JSFiddle - React, Tailwind, and code Playground

HTML

<nav>
    <ul class="panel">
        <li class=""> <a href="#">
                <div class="front">
                <span style="color:black;">Aboutus</span>
                </div>
                <div class="back">
                    <span style="color:black;" >HOME</span>
                </div>
            </a>

        </li>
    </ul>
</nav>

CSS

@import url(http://fonts.googleapis.com/css?family=Roboto:400,100,300,500,700,900);
@import url(http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.css);

nav ul {
 
  position: relative;
 
 
  clear: both;
}

nav ul li {
  list-style: none;
  float: left;
}

nav ul li a {
  
    float: left;
    margin: 0 10px;
  -webkit-perspective: 600px;
     -moz-perspective: 600px;
      -ms-perspective: 600px;
          perspective: 600px;
}

nav ul li .front {
  text-align: center;
  -webkit-transform: rotateX(0deg) rotateY(0deg);
     -moz-transform: rotateX(0deg) rotateY(0deg);
      -ms-transform: rotateX(0deg) rotateY(0deg);
       -o-transform: rotateX(0deg) rotateY(0deg);
  -webkit-transition: all 0.5s ease-in-out;
     -moz-transition: all 0.5s ease-in-out;
      -ms-transition: all 0.5s ease-in-out;
       -o-transition: all 0.5s ease-in-out;
          transition: all 0.5s ease-in-out;
  -webkit-backface-visibility: hidden;
     -moz-backface-visibility: hidden;
      -ms-backface-visibility: hidden;
       -o-backface-visibility: hidden;
          backface-visibility: hidden;
  -webkit-transform-style: preserve-3d;
     -moz-transform-style: preserve-3d;
       -o-transform-style: preserve-3d;
          transform-style: preserve-3d;
}

nav ul li:hover .front {
  -webkit-transform: rotateX(0deg) rotateY(180deg);
     -moz-transform: rotateX(0deg) rotateY(180deg);
      -ms-transform: rotateX(0deg) rotateY(180deg);
       -o-transform: rotateX(0deg) rotateY(180deg);
}

nav ul li .back {
  position: absolute;
  top: 0;
  width: inherit;
  height: inherit;
  text-align: center;
  z-index: -1;
  -webkit-transform: rotateX(0deg) rotateY(-180deg);
     -moz-transform: rotateX(0deg) rotateY(-180deg);
      -ms-transform: rotateX(0deg) rotateY(-180deg);
       -o-transform: rotateX(0deg) rotateY(-180deg);
  -webkit-transition: all 0.5s ease-in-out;
     -moz-transition: all 0.5s ease-in-out;
      -ms-transition: all 0.5s ease-in-out;
       -o-transition:...