#resImage_242 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.articulategroup.co.uk/assets/images/a/cctv-sq-9238be64.jpg');
    background-repeat:no-repeat;
    background-position:center center;
        width:100%;
    background-size: cover;
        height:420px;
}
@media screen and (min-width:700px){
    #resImage_242 {
        background-image:url('https://www.articulategroup.co.uk/assets/images/4/cctv-99308763.jpg');
                height:500px;
    }
}
@media screen and (min-width:1000px){
    #resImage_242 {
        background-image:url('https://www.articulategroup.co.uk/assets/images/8/cctv-4c71e62a.jpg');
                height:620px;
    }
}
@media screen and (min-width:1400px){
    #resImage_242 {
        background-image:url('https://www.articulategroup.co.uk/assets/images/1/cctv-985414b1.jpg');
                height:620px;
    }
}