<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
#yourPageContainer {
width: 1000px;
border: 1px solid #f00;
}
#otherElements {
background-color: #afa;
width: 200px;
height: 100px
}
@media screen and (max-width:500px) {
#yourPageContainer {
width: 500px;
}
#otherElements {
background-color: #aaf;
width: 100px;
}
}
@media screen and (max-width:300px) {
#yourPageContainer {
width: 300px;
}
#otherElements {
background-color: #faa;
width: 50px;
}
}
</style>
</head>
<body>
<div id="yourPageContainer">
<div id="otherElements">Other elements</div>
</div>
</body>
</html>
【media】
