@media screen and (max-width: 550px) {
    .xxx-news-section__sub-news {
      -ms-flex-wrap: nowrap;
      flex-wrap: nowrap;
      -webkit-box-orient: vertical;
      -webkit-box-direction: normal;
      -ms-flex-direction: column;
      flex-direction: column;
    }
    .xxx-news-section__sub-news-item {
      width: 100%;
    }
    .xxx-news-section__sub-news-item:last-child {
      margin-bottom: 0;
    }
    .xxx-news-section__sub-news-item:nth-child(even), .xxx-news-section__sub-news-item:nth-child(odd) {
      margin-right: 0;
      margin-left: 0;
    }
}

@media screen and (max-width: 740px) {

    .xxx-news-section__sub-news--first-big .xxx-news-section__sub-news-item:nth-child(even) {
        margin-right: 0;
        margin-left: 0;
    }

    .xxx-news-section__sub-news--first-big .xxx-news-section__sub-news-item:nth-child(odd) {
        margin-right: 0;
        margin-left: 0;
    }

    .xxx-news-section__sub-news--first-big .xxx-news-section__sub-news-item .xxx-news-block__title--heading-title.xxx-news-block__title {
      font-size: 18px;
  }

}