@media (max-width: 767px) {
    body {
        /*color:orange;*/
    }
}
@media (min-width: 768px) and (max-width: 991px) { 
    body {
        
    }
}
@media (min-width: 992px) and (max-width: 1200px) { 
    body {

    }
}
@media (min-width: 1200px) { 
    body {
        /*color:red;*/
    }
}