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rdw1.css

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

body {
//css
}

#content {
//css
}

// and so on…

}

RWD-WWWH.html

<meta name="viewport" content="width=device-width; initial-scale=1">

rwd2.css

@media only screen and (min-width: 480px) and (max-width: 767px) {

body {
width: 436px;
padding: 36px 22px 48px;
}

}

rwd3.css

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

}

Hoặc:

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

}

Hoặc:

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

}