#resImage_820 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.artificialgrassmaintenance.co.uk/assets/images/d/the-daily-mile-header-pic-fac74d93.jpg');
    background-repeat:no-repeat;
    background-position:center center;
        width:100%;
    background-size: cover;
        height:550px;
}
@media screen and (min-width:700px){
    #resImage_820 {
        background-image:url('https://www.artificialgrassmaintenance.co.uk/assets/images/d/the-daily-mile-header-pic-fac74d93.jpg');
                height:550px;
    }
}
@media screen and (min-width:980px){
    #resImage_820 {
        background-image:url('https://www.artificialgrassmaintenance.co.uk/assets/images/7/the-daily-mile-header-pic-aaa39fb4.jpg');
                height:625px;
    }
}
@media screen and (min-width:1400px){
    #resImage_820 {
        background-image:url('https://www.artificialgrassmaintenance.co.uk/files/images/installation/daily-mile/the-daily-mile-header-pic.jpg');
                height:625px;
    }
}