#resImage_204 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.conveyorrollers.co.uk/assets/images/f/240v-415v-AC-powered-conveyors-9861691a.jpg');
    background-repeat:no-repeat;
    background-position:center center;
        width:100%;
    background-size: cover;
        height:380px;
}
@media screen and (min-width:700px){
    #resImage_204 {
        background-image:url('https://www.conveyorrollers.co.uk/assets/images/3/240v-415v-AC-powered-conveyors-818c16ff.jpg');
                height:300px;
    }
}
@media screen and (min-width:980px){
    #resImage_204 {
        background-image:url('https://www.conveyorrollers.co.uk/assets/images/c/240v-415v-AC-powered-conveyors-9c52875b.jpg');
                height:580px;
    }
}
@media screen and (min-width:1400px){
    #resImage_204 {
        background-image:url('https://www.conveyorrollers.co.uk/assets/images/4/240v-415v-AC-powered-conveyors-d3c8f760.jpg');
                height:580px;
    }
}