.modal-window{
    display: none;
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 11;
    background-color: rgba(40,40,40,0.8);
    align-items: center;
    justify-content: center;
}

.modal-window > div{
    padding: 15px 30px;
    background-color: white;
    border-radius: 5px;
}

.modal-window.show{
    display: flex;
}