.adp {
    display: flex;
    box-sizing: border-box;
    flex-flow: column;
    position: fixed;
    z-index: 99999;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 500px;
    height: 400px;
    background-color: #ffffff;
    padding: 20px;
    border-radius: 5px;
    font-family: Arial;
}
.adp h3 {
    border-bottom: 1px solid #000;
    margin: 0;
    padding: 15px 0;
}
.adp p {
     flex-grow: 1;
}
.adp-underlay {
    background-color: rgba(0, 0, 0, 0.75);
    position: fixed;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 99998;
}