To apply just one of articles add css class (e.g. no-padding) to the article  and change custom less/css:

.article.no-padding {
    .article-inner {
        padding:0;
        @media all and (max-width: (@device-width-large + 20px)) {
            padding: 0;
        }
        @media all and (max-width: (@device-width-small + 20px)) {
            padding: 0;
        }
    }
}