.card{
    display: inline-block;
    width: 30%;
    box-shadow:  0px 0px 15px black;
    margin: 10px;
}
.preview{
display: inline-block;
    width: 90%;
    margin: 5%;
    border-radius: 10px;
}
.contenu{
    margin: 10px;
}
@media screen and (max-width: 600px){
    .card{
        display: inline-block;
        width: 90%;
    }
}