.QR_wrapper {
    position: fixed;
    height: 100%;
    width: 100%;
    left: 0px;
    top: 0px;
    background: transparent;
    z-index: 10000;
    text-align: center;
    display: none;
    cursor: pointer;
}

.QR_wrapper img {
    margin-top: 10%;
}

.QR_wrapper_left_button {
    background-color: transparent;
    background-position: center right;
    background-repeat: no-repeat;
    background-image: url("../img/left.gif");
    cursor: pointer;
    position: fixed;
    left: 0px;
    top: 50%;
    margin-top: -36px;
    z-index: 10000;
    height: 79px;
    width: 72px;
}

.all_black {
    position: fixed;
    height: 100%;
    width: 100%;
    left: 0px;
    top: 0px;
    background: rgba(0, 0, 0, 0.7);
    z-index: 9999;
    display: none;
}