@media only screen and (min-width: 300px) { /random code }

@media only screen and (max-width: 400px) { /more random code }

@media only screen and (max-width: 600px) { /random code }
@media only screen and (max-width: 500px) { /random code }
@media only screen and (max-width: 400px) { /random code }

@media only screen and (min-width: 501px and max-width: 600px) { /random code }
@media only screen and (min-width: 401px and max-width: 500px) { /random code }
@media only screen and (max-width: 400px) { /random code }