HTML

<div class="hovergallery14"> <img src="http://gif" alt="" width="230" height="250" /><img src="http://6gif" alt="" width="230" height="250" /></div>   

CSS

.hovergallery14 img{ border: 2px solid #fff; 
border-radius: 1em/2em;
box-shadow: 2px 2px 6px #000000;
-webkit-transform:scale(0.9); 
-moz-transform:scale(0.9); 
-o-transform:scale(0.9);
-webkit-transition-duration: 0.2s; 
-moz-transition-duration: 0.2s;
-o-transition-duration: 0.2s; 
opacity: 0.8; 
margin:5px 1px 5px 1px; 
}
.hovergallery14 img:hover{
-webkit-box-shadow: 1px 2px 10px #000;
-moz-box-shadow: 1px 2px 10px #000;
box-shadow: 1px 2px 10px #000; 
border: 1px dotted #000;
 border-radius: 1em;
 opacity: 1;
 display: block;float: left;
-webkit-transition: margin 0.5s ease-out; 
-moz-transition: margin 0.5s ease-out; 
-o-transition: margin 0.5s ease-out;
-webkit-animation: pulse 10.5s infinite ease-in-out; /* Ici on utilise l'animation référencée plus haut */ 
}