footer
{
    position: relative;
    top: 200px;
    margin-left: auto;
    margin-right: auto;
    background-color: rgb(224, 220, 220);
    width:99%;
    height: 100px;
    border-width: 2px;    
    border:solid black;
    text-align: center;
}
footer h4
{
    text-align: left;
    font-size: 9px;
    color: black;
    padding-left: 3%;    
}
@media only screen and (max-device-width :480px )
/*modif ok*/
    {.footer
    {width: auto;
    top:100px;}
}