#feb14 {
    height: 500px;
    background-image: url(https://images.biggeek.ru/images/14feb_mob.png);
    background-size: 800px 500px;
    background-repeat:no-repeat;
    background-position: center center;

    @media (min-width: 800px) {
        background-image: url(https://images.biggeek.ru/images/14feb_tab.png);
        background-size: 1200px 500px;
    }

    @media (min-width: 1200px) {
        background-image: url(https://images.biggeek.ru/images/14feb_desk.png);
        background-size: 1440px 500px;
    }

}