.responsive-cont {
    margin-bottom: 30px;
    display: inline-block;
}
.responsive-cont_img {
    position: relative;
    padding-bottom: 66%;
    margin-bottom: 10px;
}
.responsive-cont_img img {
    position: absolute;
    width: 100%;
    height: 100%;
}

.responsive-iframe {
    width: 1024px;
    height: 576px;
}

@media screen and (max-width: 767px) {
    .modal_block.fullscreen div.inner, .modal_block.fullscreen div.inner>.modal_content {
        height: auto !important;
    }
    .modal_block.fullscreen {
        height: auto !important;
    }
    .modal_block div.inner div.modal_content {
        position: relative;
        overflow: hidden;
        width: 100%;
        padding-top: 56.25% !important;
        height: auto !important;
    }
    .responsive-iframe {
        position: absolute;
        top: 0;
        left: 0;
        bottom: 0;
        right: 0;
        width: 100%;
        height: 100%;
    }
}