<!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>
.content {
width: 1000px;
background-color: #999;
display: flex;
justify-content: space-between;
flex-wrap: wrap;
}
.content .box {
width: 210px;
height: 100px;
margin: 10px 20px; /* margin 需要计算*/
background-color: aqua;
}
/* 1.外层元素加伪类设置flex：auto */
/* .content::after{
content: '';
flex: auto;
} */
</style>
</head>
<body>
<div class="content">
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
<!-- 2.一行需要几个元素就写n-2个下面的标签-->
<div class="box" style="visibility: hidden;height: 0"></div>
<div class="box" style="visibility: hidden;height: 0"></div>
</div>
</body>
</html>
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