flex彈性分佈
彈性盒式模型
換行元素
flex-wrap
justify-content
align-content
order用來排序
劃分空間
bootstrap
模板
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="utf-8">
<title></title>
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<meta name="viewport" content="width=device-width,
initial-scale=1.0, minimum-scale=1.0,maximum-scale=1.0,user-saclable=no"/>
<link rel="stylesheet" type="text/css" href="./css/bootstrap.css">
<link rel="stylesheet" type="text/css" href="./css/index.css">
</head>
<body></body>
</html>
