body {
    margin: 0px;
    background: darkgray;
}
    @media only screen and (min-device-width: 1024px){
        body{
            max-width: 100%;
            background: darkgray url("../images/error-image.png");
            background-repeat: no-repeat;
            background-size: contain;
        }
    }
    @media only screen and (max-device-width: 1023px){
        body{
            max-width: 100%;
            background: darkgray url("../images/error-image-mobile.png");
            background-repeat: no-repeat;
            background-size: contain;
            background-position: center center;
        }
    }