@media only screen and (max-width: 767px) {

}

@media only screen and (max-width: 991px) {

}

@media only screen and (min-width: 992px) {

}

@media only screen and (min-width: 992px) and (max-width: 1199px) {

}

@media only screen and (min-width: 1200px) {
    .content_side img {
        width: 40%;
        height: auto;
    }
}