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<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
.box{
height: 100vh;
display: flex;
flex-wrap: wrap; /* nowrap | wrap | wrap-reverse;*/
/* flex-direction:column; 主轴 垂直 排列 起点上沿*/
/*flex-direction:column-reverse 垂直排列 起点下沿;*/
/*flex-direction: row 水平排列 起点左端;*/
/*flex-direction: row-reverse 水平排列 起点右端;*/
/*flex-flow属性是flex-direction属性和flex-wrap属性的简写形式，默认值为row nowrap。*/
/*justify-content:flex-start; x轴左对齐*/
/* justify-content:space-between; 两端对齐，项目间距相等*/
/*justify-content:flex-end; x轴右对齐*/
/*justify-content:center; x轴中间对齐*/
/*justify-content:space-around 项目两侧的间隔相等; */
/*align-items:flex-end; y轴 底部对齐*/
/*align-items:flex-start; y轴 顶部对齐*/
/*align-items: center; 中间对齐*/
/*align-items:baseline baseline: 项目的第一行文字的基线对齐。*/
/*align-items:stretch; 占满整个容器的高度*/
/*align-content: center;*/
}
.item{
border: 1px solid red;
}
</style>
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