html{ 
  margin:0;
  padding:0;
  background-position: center;
  -webkit-background-size: cover; /* pour anciens Chrome et Safari */
  background-size: cover; /* version standardisée */
}
img.menu{
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 50%;
    display: inline-block;
    overflow: hidden;
    width: 100px;
    height: 100px;
    line-height: 100px;
    background-size: cover;
    object-fit: cover;
}
img.exit{
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 50%;
    display: inline-block;
    overflow: hidden;
    width: 50px;
    height: 50px;
    line-height: 50px;
    background-size: cover;
    object-fit: cover;
}
img.apercu{
	border: 1px solid #ddd;
	Width: 100px;
    background-size: cover;
}
img.cachepub{
  bottom: 0px;
  position: absolute; /* postulat de départ */

}img.cacheadm{
  bottom: 0px;
  right: 0px;
  position: absolute; /* postulat de départ */

}