.overlay {
    display: none;
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    top: 0;
    background: rgba(0,0,0,.89);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}
.overlay.show {
    display: flex;
}
.overlay-container {
    background: #FFF;
    border-radius: 10px;
    padding: 2rem 3rem;
    max-width: 768px;
    margin: 0 auto;
    position: relative;
}
.overlay-container .headline {
    font-size: 2rem;
    font-weight: bold;
}
#close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 2rem;
    cursor: pointer;
}