### 使用媒体查询： @media screen and (max-width: 640px) {}
~~~
<style>
* {
margin: 0;
padding: 0
}
.container {
display: grid;
grid-gap: 5px;
grid-template-columns: repeat(12, 1fr);
grid-template-rows: 50px 350px 50px;
grid-template-areas:
"h h h h h h h h h h h h"
"m m c c c c c c c c c c"
"f f f f f f f f f f f f";
}
.container div {
text-align: center;
border: 1px solid #333;
}
.header {
grid-area: h;
}
.menu {
grid-area: m;
}
.content {
grid-area: c;
}
.footer {
grid-area: f;
}
@media screen and (max-width: 640px) {
.container {
grid-template-areas:
"m m m m m m h h h h h h"
"c c c c c c c c c c c c"
"f f f f f f f f f f f f";
}
}
</style>
</head>
<body>
<div class="container">
<div class="header">HEADER</div>
<div class="menu">MENU</div>
<div class="content">CONTENT</div>
<div class="footer">FOOTER</div>
</div>
</body>
~~~
