#resImage_337 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.tjelectrical.co.uk/assets/images/c/smc-72253830.jpg');
    background-repeat:no-repeat;
    background-position:center center;
        width:100%;
    background-size: cover;
        height:450px;
}
@media screen and (min-width:700px){
    #resImage_337 {
        background-image:url('https://www.tjelectrical.co.uk/assets/images/d/smc-3d09d376.jpg');
                height:375px;
    }
}
@media screen and (min-width:980px){
    #resImage_337 {
        background-image:url('https://www.tjelectrical.co.uk/assets/images/0/smc-03d4c463.jpg');
                height:470px;
    }
}
@media screen and (min-width:1400px){
    #resImage_337 {
        background-image:url('https://www.tjelectrical.co.uk/assets/images/0/smc-03d4c463.jpg');
                height:470px;
    }
}