<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<div class="box">
<div class="item">1</div>
<div class="item">2</div>
<div class="item">3</div>
<div class="item">1</div>
<div class="item">2</div>
</div>
</body>
<style>
.box {
display: flex;
flex-wrap: wrap ;
justify-content: center;
align-items: center
}
.item {
width: 30%;
height: 50px;
border-radius: 20px;
margin: 20px;
background-color: beige;
}
</style>
</html>
标签：flex,center,弹性,简易,html,wrap,20px From： https://www.cnblogs.com/uoky/p/18396427