.beforeafter { 
  position: relative; 
  overflow: hidden; 
}
.before, .after {
  position: absolute; top: 0; left: 0;
}
.before { 
  border-right: 5px solid #000;
  -moz-box-shadow: 1px 0 10px #222;
  -webkit-box-shadow: 1px 0 20px #222;
  box-shadow: 1px 0 10px #222;
}
.help { 
  position: absolute;
  top: 20px;
  left: 20px;
  font: bold 20px Helvetica, Arial, sans-serif;
  color: #fff;
  text-shadow: 0px 2px 2px #000;
}