<!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>
.parent{
width: 300px;
height: 250px;
background-color: #ccc;
margin: 0 auto;
display: flex;
flex-direction: row;
flex-wrap: wrap;
flex-flow: column nowrap;
}
.parent>div{
width: 60px;
height: 50px;
color: white;
}
</style>
</head>
<body>
<div class="parent">
<div class="div1" style="background-color: red;">弹性元素1</div>
<div class="div2" style="background-color: green;">弹性元素2</div>
<div class="div3" style="background-color: blue;">弹性元素3</div>
<div class="div1" style="background-color: red;">弹性元素1</div>
<div class="div2" style="background-color: green;">弹性元素2</div>
<div class="div3" style="background-color: blue;">弹性元素3</div>
</div>
</body>
</html>
