.button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%)
}

.button a {
  display: block;
  height: 50px;
  width: 200px;
  background: #00b7ea;
  color: white;
  font: 17px/50px Helvetica, Verdana, sans-serif;
  text-decoration: none;
  text-align: center;
  text-transform: uppercase;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  -webkit-box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  -moz-box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  background: -moz-linear-gradient(top, #00b7ea 0%, #009ec3 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,#00b7ea), color-stop(100%,#009ec3));
  background: -webkit-linear-gradient(top, #00b7ea 0%,#009ec3 100%);
  background: -o-linear-gradient(top, #00b7ea 0%,#009ec3 100%);
  background: -ms-linear-gradient(top, #00b7ea 0%,#009ec3 100%);
  background: linear-gradient(top, #00b7ea 0%,#009ec3 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00b7ea', endColorstr='#009ec3',GradientType=0 );
}

b {
  background: #222;
  display: block;
  height: 40px;
  width: 180px;
  margin: -50px 0 0 10px;
  text-align: center;
  font: 12px/45px Helvetica, Verdana, sans-serif;
  color: #fff;
  position: absolute;
  z-index: -1;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px;
  -webkit-box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  -moz-box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  -webkit-transition: all 0.5s ease;
  -moz-transition: all 0.5s ease;
  -o-transition: all 0.5s ease;
  -ms-transition: all 0.5s ease;
  transition: all 0.5s ease;
}

.button a, b {
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;
  -webkit-box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  -moz-box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
  box-shadow: 2px 2px 8px rgba(0,0,0,0.2);
}

.button:hover .top {
  margin: -80px 0 0 10px;
  line-height: 35px;
}

.button:hover .bottom {
  margin: -10px 0 0 10px;
}

.button a:active {
  background: #00b7ea;
  background: -moz-linear-gradient(top,  #00b7ea 36%, #009ec3 100%);
  background: -webkit-gradient(linear, left top, left bottom, color-stop(36%,#00b7ea), color-stop(100%,#009ec3));
  background: -webkit-linear-gradient(top,  #00b7ea 36%,#009ec3 100%);
  background: -o-linear-gradient(top,  #00b7ea 36%,#009ec3 100%);
  background: -ms-linear-gradient(top,  #00b7ea 36%,#009ec3 100%);
  background: linear-gradient(top,  #00b7ea 36%,#009ec3 100%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00b7ea', endColorstr='#009ec3',GradientType=0 );
}

.button:active .bottom {
  margin: -20px 0 0 10px;
}

.button:active .top {
  margin: -70px 0 0 10px;
}