#resImage_3989 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.cntech.co.uk/assets/images/f/service-repair-mobile-xw3vj4fw4543egs.jpg');
    background-repeat:no-repeat;
    background-position:center center;
    width:100%;
    background-size: cover;
    height:580px;
}
@media screen and (min-width:700px){
    #resImage_3989 {
        background-image:url('https://www.cntech.co.uk/assets/images/4/service-repair-h8f2kqbfv4hp1ps.jpg');
        height:465px;
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}
@media screen and (min-width:980px){
    #resImage_3989 {
        background-image:url('https://www.cntech.co.uk/assets/images/n/service-repair-7ms9hf0c5kdqe1j.jpg');
        height:465px;
    }
}
@media screen and (min-width:1400px){
    #resImage_3989 {
        background-image:url('https://www.cntech.co.uk/assets/images/n/service-repair-7ms9hf0c5kdqe1j.jpg');
        height:465px;
    }
}