#element_to_pop_up {
    text-align: center;
    background-color: #FFF;
    border-radius: 10px;
    box-shadow: 0px 0px 25px 5px #999;
    color: #111;
    min-width: 450px;
    padding: 25px;
    width: 650px;
    left: 0 !important;
    right: 0 !important;
    margin: 0 auto;
}

.b-close, .b-not_close {
    background-color: #2B91AF;
    color: #FFF;
    cursor: pointer;
    display: inline-block;
    border-radius: 7px;
    font: bold 131% sans-serif;
    padding: 0px 6px 2px;
    /* position: absolute; */
    /* right: -7 px; */
    /* top: -7 px; */
}

@media (max-width: 768px) {

        #element_to_pop_up img {
        width: 100%;
    }
    #element_to_pop_up {
        width: 100%;
        min-width: auto;
    }

    .b-close {
        margin-left: 5% !important;
    }

    .b-not_close {
        margin-right: 5% !important;
    }

    .margin_mobile {
        margin: 10px !important;
    }

    .pc_width {
        width: 100%;
    }
}