/* Модальное окно */
.modal-window {
    display: inline-block;
}

    .modal-window > .modal-trigger {
        display: none;
    }

        .modal-window > .modal-trigger ~ .modal-overlay {
            top: 0;
            left: 0;
            opacity: 0;
            width: 100%;
            height: 100%;
            z-index: 100;
            position: fixed;
            visibility: hidden;
            transition: opacity 0.3s;
            background-color: rgba(0,0,0,0.5);
        }

        .modal-window > .modal-trigger ~ .modal-container {
            top: 50%;
            left: 50%;
            opacity: 0;
            z-index: 110;
            position: fixed;
            visibility: hidden;
            transition: opacity 0.3s;
            transform: translate(-50%, -50%);
        }

        .modal-window > .modal-trigger:checked ~ .modal-overlay,
        .modal-window > .modal-trigger:checked ~ .modal-container {
            opacity: 1;
            visibility: visible;
        }

/* Кнопка */
.btn-modal {
    color: #fff;
    cursor: pointer;
    line-height: 3rem;
    padding: 1rem 3rem;
    background-color: #83bec5;
}

    .btn-modal:hover {
        background-color: #527c82;
    }

/* Содержимое модального окна */
.modal-content {
    overflow: hidden; /*Для прокрутки в модальном окне надо поменять на overflow: auto и добавить высоту окна*/
    background-color: #fff;
}

    .modal-content .modal-content-header,
    .modal-content .modal-content-body {
        padding: 1rem 2rem;
    }

    /* Кнопка Закрыть */
    .modal-content .modal-content-footer {
        display: flex;
        align-items: center;
        justify-content: center;
    }

        .modal-content .modal-content-footer .item {
            flex: 1;
            padding: 1rem;
            text-align: center;
        }

            .modal-content .modal-content-footer .item.action {
                background-color: #83bec5;
                cursor: pointer;
            }

                .modal-content .modal-content-footer .item.action:hover {
                    background-color: #aed9e1;
                }