<!DOCTYPE html>
<html>
<head>
<style>
aside{
width: 200px;
height: 200px;
background: #5A6A94;
}
section{
height: 200px;
background: #BE4F4F;
}
</style>
</head>
<body>
<div class="container">
<aside class="left">Left</aside>
<section class="right">right</section>
</div>
</body>
</html>
左邊設置左浮動，右邊寬度設置100%
不需要設置右邊寬度100%也可以實現這樣的效果，塊級元素默認寬度爲100%
<!DOCTYPE html>
<html>
<head>
<style>
aside{
width: 200px;
height: 200px;
background: #5A6A94;
float: left;
}
section{
height: 200px;
background: #BE4F4F;
width: 100%;
}
</style>
</head>
<body>
<div class="container">
<aside class="left">Left</aside>
<section class="right">right</section>
</div>
</body>
</html>
父容器設置 display：flex；right部分設置 flex：1
<!DOCTYPE html>
<html>
<head>
<style>
.container{
display: flex;
}
aside{
width: 200px;
height: 200px;
background: #5A6A94;
}
section{
height: 200px;
background: #BE4F4F;
flex: 1;
}
</style>
</head>
<body>
<div class="container">
<aside class="left">Left</aside>
<section class="right">right</section>
</div>
</body>
</html>使用負margin
<!DOCTYPE html>
<html>
<head>
<style>
.container{
float: left;
width: 100%;
}
aside{
width: 200px;
height: 200px;
background: #5A6A94;
}
section{
height: 200px;
background: #BE4F4F;
}
.right{margin-left: 200px;}
.left{
float: left;
margin-left: -100%;
}
</style>
</head>
<body>
<div class="container">
<section class="right">right</section>
</div>
<aside class="left">Left</aside>
</body>
</html><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
.content{
width: 100%;
height: 200px;
background-color: #00ccff;
float: left;
}
.right{
margin-left: 200px;
}
.left{
width: 200px;
height: 200px;
background-color: #8A0E00;
float: left;
margin-left: -100%;
}
</style>
</head>
<body>
<div class="content">
<div class="right">right</div>
</div>
<div class="left">left</div>
</body>
</html>