- 開啓flex元素的叫：flex-contianer
![image-20210224123639890]()
- flex-contianer中的子元素叫：flex-items
開啓flex屬性
<!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>
#box{
/* 開啓flex佈局：塊元素 */
display: flex;
/* 開啓flex佈局；行元素 */
/* display: inline-flex; */
background-color: red;
width: 500px;
/* 水平居中 */
margin: 0 auto;
/* row: 默認值從main start -> main end
row-reverse: 反轉 從右到左
column : 從上倒下
column-reverse: 從下到上
*/
flex-direction: column-reverse;
}
.item{
text-align: center;
line-height: 100px;
width: 100px;
}
.item1{
background-color: azure;
}
.item2{
background-color: green;
}
.item3{
background-color: gold;
}
</style>
</head>
<body>
<div id="box">
<div class="item item1">item1</div>
<div class="item item2">item2</div>
<div class="item item3">item3</div>
</div>
<strong>行類元素</strong>
</body>
</html>
flex佈局模型主軸/交叉軸
![image-20210224124656595]()
