flex
- 菜鸟教程地址:https://www.runoob.com/w3cnote/flex-grammar.html
- flex-direction
- flex-wrap
- flex-flow
- justify-content
- align-items
- align-content
flex-direction属性决定主轴的方向(即项目的排列方向)。
.box {
flex-direction: row | row-reverse | column | column-reverse;
}