.page-connexion .voile-blanc {
    pointer-events: none;
}

.modal {
    z-index: 2000;
}

.modal-backdrop {
    z-index: 1050;
}

#puzzle {
    width: 400px;
    height: 400px;
    display: grid;
    grid-template-columns: 200px 200px;
    grid-template-rows: 200px 200px;
    border: 2px solid black;
    margin: 0 auto 20px auto;
    overflow: hidden;
}

.case {
    width: 200px;
    height: 200px;
    border: 1px solid #ccc;
    box-sizing: border-box;
    background-repeat: no-repeat;
    background-size: 400px 400px;
    cursor: pointer;
}

.selectionnee {
    border: 3px solid blue;
}