.masque{
    background-color:rgba(0,0,0,0.5);
    position:absolute;
    top:0;
    height:700px;
    display:none;
}
.modal {
    width:50%;
    position:relative;
    top:60px;
    margin:auto;
    z-index:1;
    box-shadow: 0px 1em 2em rgba(0,0,0,0.7);
    display:none;
}