.calque1{position:relative; right:50%; bottom:25%; width:300px; height:60px; z-index:10; }
<div id="Layer2" style="position:absolute; right:50%; bottom:25%; width:300px; height:60px; z-index:10; background-color: green; ">Utilisation de right</div>
.calque2{position:relative; bottom:20%; right:50%; width:300px; height:60px; z-index:1; }
<div id="Layer1" style="position:absolute; bottom:20%; right:50%; width:300px; height:60px; z-index:1; background-color: #CC0000; ">Utilisation de right</div>
.calque1{position:relative; right:50%; bottom:25%; width:300px; height:60px; z-index:10; }
