#resImage_801 {
    display:block;
    overflow:hidden;
    background-image:url('https://www.artificialgrassmaintenance.co.uk/assets/images/c/3g-header-4651724a.jpg');
    background-repeat:no-repeat;
    background-position:center center;
        width:100%;
    background-size: cover;
        height:550px;
}
@media screen and (min-width:700px){
    #resImage_801 {
        background-image:url('https://www.artificialgrassmaintenance.co.uk/assets/images/c/3g-header-4651724a.jpg');
                height:550px;
    }
}
@media screen and (min-width:980px){
    #resImage_801 {
        background-image:url('https://www.artificialgrassmaintenance.co.uk/assets/images/f/3g-header-78f979dc.jpg');
                height:625px;
    }
}
@media screen and (min-width:1400px){
    #resImage_801 {
        background-image:url('https://www.artificialgrassmaintenance.co.uk/files/images/installation/3g/3g-header.jpg');
                height:625px;
    }
}