css3 布局fiex和box-sizing 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"> 
<title>css3 布局常用参数</title>
<style> 
 
.box2{
width:100%;height:100vh;
 display:flex;/**/
 justify-content:center;/*内容居中,简单理解为水平 X */
 align-items:center;/*容器居中,简单理解为水平 Y */
 }
.box{
 box-sizing:border-box; /*无论怎么设置,最终大小都是width的100px */
 margin:10px;
 width:100px;height:100px;
  border: 10px solid red; 
}
</style>
</head>
<body>
<div class="box2">
<div class="box">1</div> 
<div class="box">2</div> 
<div class="box">3</div> 
</div>
</body>
</html>

　效果

 

 

　更多请了解:https://www.runoob.com/w3cnote/flex-grammar.html

posted @ 2021-12-05 18:43  freedom/cn  阅读(69)  评论(0)    收藏  举报