.ass{
    width: 90%;
    margin: 5%;
    border: 10px;
    box-shadow: 0px 0px 0px blue;
}
.item{
    display: inline-block;
    width: 30%;
    border-radius: 10px;
    box-shadow: 0px 0px 10px black;
    margin: 5px;
    padding: 0px;
}
.contenu{
    margin: 10px;
}
@media screen and (max-width:600px){
.item{
    display: inline-block;
    width: 100%;
}
}
.pam{
    float:right;
}