代码编辑器：
x
1
2
<meta charset="utf-8">3
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 4
<style> 5
#main {6
width: 400px;7
height: 150px;8
border: 1px solid #000000;9
display: flex;10
justify-content: space-around; 11
}12
13
#main div {14
width: 70px;15
height: 70px;16
}17
</style>18