<div class="wrapper">
<ul class="gallery">
  <li><a href="#" data-tooltip="Superman"><img src="http://www.cap-that.com/dc/superman/unbound/250x150image.jpg"/></a></li>
  
  <li><a href="#" data-tooltip="Marvel"><img src="http://www.lifeofandroid.com//wp-content/uploads/2012/04/marvel-widget.jpg"/></a></li>
  
  <li><a href="#" data-tooltip="Batman"><img src="http://cdn1-www.comingsoon.net/assets/uploads/1970/01/file_583520_batman-tired.jpg"/></a></li>
  
    <li><a href="#" data-tooltip="Spiderman"><img src="http://cartoonexplorer.com/wp-content/photos/2014/07/New-spiderman-movie-250x150.jpeg"/></a></li>
</ul>
</div>

@import url(https://fonts.googleapis.com/css?family=Open+Sans:600);

body {
 background:url('http://subtlepatterns2015.subtlepatterns.netdna-cdn.com/patterns/contemporary_china.png');
  font-family: 'Open Sans', sans-serif;
  font-weight:600;
  text-align:center;
}

.wrapper {
  margin: 0 auto;
  margin-top:2%; 
}

ul.gallery {
  position: relative;
  z-index: 1;
  overflow: hidden;
  list-style: none;
  padding:5px;
}


ul.gallery li {
  border:5px solid #fff;
  position: relative;
  display:inline-block;
  width: 250px;
  height: 150px;
  margin: 0 30px 30px 0;
  background: #fff;
  -webkit-box-shadow: 0 1px 4px #ccc, 0 0 40px #ccc inset;
  -moz-box-shadow: 0 1px 4px #ccc, 0 0 40px #ccc inset; 
  box-shadow: 0 1px 4px #ccc, 0 0 40px #ccc inset;}

ul.gallery li:before,
ul.gallery li:after {
  content: '';
  z-index: -1;
  position: absolute;
  left: 10px;
  bottom: 10px;
  width: 70%;
  height: 55%;
  -webkit-box-shadow: 0 15px 16px #6b6b6b;
  -moz-box-shadow: 0 15px 16px #6b6b6b;
  box-shadow: 0 15px 16px #6b6b6b;
  -webkit-transform: skew(-15deg) rotate(-6deg);
  -moz-transform: skew(-15deg) rotate(-6deg);
  -ms-transform: skew(-15deg) rotate(-6deg);
  -o-transform: skew(-15deg) rotate(-6deg);
  transform: skew(-15deg) rotate(-6deg); 
}

ul.gallery li:after {
  left: auto;
  right: 11px;
  -webkit-transform: skew(15deg) rotate(6deg);
  -moz-transform: skew(15deg) rotate(6deg);
  -ms-transform: skew(15deg) rotate(6deg);
  -o-transform: skew(15deg) rotate(6deg);
  transform: skew(15deg) rotate(6deg); 
}

a img {
  border:none;
}

a {
  position: relative;
  text-decoration: none;
}
 
a:after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 0%;
  top;
  left: 0;
  background: #111;
  padding: 5px 15px;
  color: white;
  font-family: 'Open Sans', sans-serif;
  text-shadow: 0px 0px 1px #000;
  white-space: nowrap;
  opacity: 0;
  -webkit-transition: all 0.4s ease;
  -moz-transition   : all 0.4s ease;
  width:85;
}
  
a:before {
  content: "";
  position: absolute;
  width: 0;
  height: 0;
  -webkit-transition: all 0.4s ease;
  -moz-transition   : all 0.4s ease;
  opacity: 0;
  left: 30%;
  bottom: 90%;
}

a:hover:after {
  bottom: 100%;
}
  
a:hover:before {
  bottom: 70%;
}

a:hover:after, a:hover:before {
  opacity: 1;
}