<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
/* 当屏幕上页面宽度大于等于800px属性会生效 */
@media screen and (min-width:800px) {
html {
font-size: 14px;
background-color: rgb(196, 30, 140);
}
}
@media screen and (max-width:800px) {
html {
font-size: 14px;
background-color: aqua;
}
}
@media screen and (max-width:500px) {
html {
font-size: 10px;
background-color: brown;
}
}
/* rem等于html的字体大小 */
div {
text-align: center;
height: 10rem;
font-size: 5rem;
}
</style>
</head>
<body>
<div>hello</div>
</body>
</html>