/* max-width  */
@media screen and (max-width: 600px) {

}

/* min-width */
@media screen and (min-width: 900px) {

}

/* min-width & max-width */
@media screen and (min-width: 600px) and (max-width: 900px) {

}

/* max device width */
@media screen and (max-device-width: 480px) {

}