.overlay{
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%; 
    height: 100%;
    background-color: rgba(0,0,0,0.4);
    display: flex;
    justify-content: center;
    align-items: center;
}

.body{
    background-color: #fefefe;
    margin-left: auto;
    margin-right: auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-height: 99%;
    overflow: hidden;
}

.hidden{
    display: none;
}