文章和旁白的宽度相同
header,main,aside,article,footer{
background-color: lightblue;
border: 3px solid red;
height: 200px;
margin: 0;
}
header {
}
main {
width: 60%;
float: left;
}
aside{
width: 20%;
float: left;
}
article {
width: 20%;
float: right;
}
footer{
clear: both;
}
<header>
<h2>Header</h2>
</header >
<main>
<h2>Main</h2>
</main>
<aside>
<h2>Aside</h2>
</aside>
<article>
<h2>Article</h2>
</article>
<footer>
<h2>Footer</h2>
</footer>