*{margin:0;padding:0;}
body{background-color:black;}
#viewport{width:320px;height:460px;border:1px solid white;margin:auto;position:relative;}
#jeu{width:100%;height:100%;}
#pub{background-color:red;width:320px;height:50px;position:absolute;bottom:0px;left:50%;margin-left:-160px;}