.backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 200, 255, 0.5);
}

.backdrop.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.modal {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);

    min-height: 300px;
    min-width: 400px;
    padding: 15px;

    background-color: #fff;
}