.modal {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 100%;
    z-index: 101;
    display: none;
    background-color: rgba(27, 43, 56, .65);
    overflow: auto;
}

.modal.active {
    display: block;
}