<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewort" content="width=device-width,initial-sanle=1">
<title>Title
</title>
<style>
*{
margin:
0;
padding:
0;
}
.
box{
width:
100%;
height:
50px;
background:
red;
}
@media screen and (
max-width:
700px){
.
box{
background:
green;
}
body{
background:
goldenrod;
}
.
head{
background:
black;
}
}
@media screen and (
max-width:
400px){
.
box{
background:
purple;
}
body{
background:
yellow;
}
.
head{
background:
gray;
}
}
.
head{
width:
1000px;
height:
200px;
background:
aqua;
}
</style>
</head>
<body>
<div class="box"></div>
<header class="head"></header>
</body>
</html>
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