弹性盒子
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
.outer{
width: 400px;
height: 400px;
background-color: antiquewhite;
display: flex; /*弹性盒子模型*/
justify-content: center;/*水平居中*/
align-items: center;/*垂直居中*/
}
.inner{
width: 100px;
height: 100px;
background-color: aqua;
text-align: center;/*文字水平居中*/
line-height: 100px;/*文字垂直水平居中和高度保持一致*/
}
</style>
<body>
<div class="outer">
<div class="inner">1</div>
<div class="inner">2</div>
<div class="inner">3</div>
</div>
</body>
</html>
结果如下
