.popup > * {
    width: 100%;
    max-width: 90vw;
}

@media (min-width: 768px) {
    .popup > * {
        width: 640px;
    }
}

.popup__close-button {
    position: absolute;
    top: 1rem;
    right: 1rem;
    z-index: 3;
}

.popup--light .popup__close-button {
    color: #fff;
}

.popup__close-button::before {
    content: '';
    position: absolute;
    inset: -0.75rem;
}