Estructura de media queries > css responsive
/* resolucion 800 x 600 */
@media (min-width: 800px) and (max-width: 959px) {
}
/* resolucion 768 x 1024 */
@media (min-width: 768px) and (max-width: 799px) {
}
/* resolucion 600 x 800 */
@media (min-width: 600px) and (max-width: 767px) {
}
/* resolucion 480 x 320 */
@media (min-width: 480px) and (max-width: 599px) {
}
/* resolucion 320 x 480 */
@media (max-width: 479px) {
}