@media screen and (max-width:320px) { 

}

@media screen and (min-width:321px) and (max-width:480px) { 

}

@media screen and (min-width:481px) and (max-width:640px) {

}

@media screen and (min-width: 641px) and (max-width: 768px) {

}

@media screen and (min-width: 769px) and (max-width: 960px) {

}

@media screen and (min-width:961px) and (max-width:1024px) {

}

@media screen and (min-width:1025px) {

}