@media screen and (max-width:300px) {

}
@media screen and (min-width:301px) and (max-width:350px) {

}
@media screen and (min-width:351px) and (max-width:420px) {

}
@media screen and (min-width:421px) and (max-width:490px) {

}
@media screen and (min-width:491px) and (max-width:620px) {

}
@media screen and (min-width:621px) and (max-width:720px) {

}
@media screen and (min-width:721px) and (max-width:820px) {

}
@media screen and (min-width:821px) and (max-width:920px) {

}
@media screen and (min-width:921px) and (max-width:1020px) {

}
@media screen and (min-width:1021px) and (max-width:1120px) {

}
@media screen and (min-width:1121px) and (max-width:1220px) {

}
@media screen and (min-width:1221px) and (max-width:1320px) {

}
@media screen and (min-width:1321px) and (max-width:1420px) {

}
@media screen and (min-width:1421px) and (max-width:1520px) {

}
@media screen and (min-width:1521px) and (max-width:1620px) {

}