html{
   height: 100%;
   padding: 0;
   margin: 0;
   overflow: hidden;
}

body{
   font-family: sans-serif;
   height:100%;
   background-color: black;
   text-align:center;
   padding: 0;
   margin: 0;
   overflow: hidden;
}

div.conteneur { 
   position: absolute;
   top: 50%;
   left: 50%;
   margin-top: -128px;
   margin-left: -128px;
}

.text-blanc a{
   color: #fff;
   text-decoration: none;
}

.text-blanc a:hover{   
   text-decoration: underline;
}