button.close {
    position: absolute;
    right: 0;
    top: -36px;
}

.close {
    font-size: 35px;
    color: #fff;
    opacity: 0.6;
    text-shadow: 0 1px 0 #000;
}

    .close:hover, .close:focus {
        color: #fff;
        opacity: .88;
    }

.modal {
    bottom: 0;
    right: 15px;
    left: auto;
    top: auto;
    overflow: visible;
}

@media (max-width: 767.98px) {
    .modal {
        left: 0;
        right: 0;
    }
}