#resImage_214 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.articulategroup.co.uk/assets/images/5/unify-phones-sq-6b406064.jpg');
    background-repeat:no-repeat;
    background-position:center center;
        width:100%;
    background-size: cover;
        height:420px;
}
@media screen and (min-width:700px){
    #resImage_214 {
        background-image:url('https://www.articulategroup.co.uk/assets/images/f/unify-phones-0ad26f87.jpg');
                height:500px;
    }
}
@media screen and (min-width:1000px){
    #resImage_214 {
        background-image:url('https://www.articulategroup.co.uk/assets/images/1/unify-phones-c243acb4.jpg');
                height:620px;
    }
}
@media screen and (min-width:1400px){
    #resImage_214 {
        background-image:url('https://www.articulategroup.co.uk/assets/images/4/unify-phones-d397d789.jpg');
                height:620px;
    }
}