使用em单位创建CSS3的Media Queries

/* ===== == = === 20em (320px) === = == ===== */

@media only screen and (min-width : 20em) {

}


/* ===== == = === 30em (480px) === = == ===== */

@media only screen and (min-width : 30em) {

}


/* ===== == = === 37.5em (600px) === = == ===== */

@media only screen and (min-width: 37.5em) {

}


/* ===== == = === 48em (768px) === = == ===== */

@media only screen and (min-width : 48em) {

}


/* ===== == = === 56.25em (900px) === = == ===== */

@media only screen and (min-width : 56.25em) {

}


/* ===== == = === 68.75em (1100px) === = == ===== */

@media only screen and (min-width : 68.75em) {

}


/* ===== == = === 81.25em (1300px) === = == ===== */

@media only screen and (min-width : 81.25em) {

}

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