Bootstrap5网格Grid水平对齐
3.1 row标签中设置垂直对齐
通过在row标签中 添加justify-content-start、justify-content-center、justify-content-end、justify-content-around、justify-content-between、justify-content-evenly可以更改列在行中的水平对齐方式。以下是一段演示代码和效果图，代码中css代码设置背景色和间距，方便查看效果。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="keywords" content="">
<meta name="description" content="">
<link href="bootstrap5/bootstrap.min.css" rel="stylesheet">
<style>
.row{background-color: rgba(0, 0, 255, 0.178);height: 120px;margin:10px;}
.col-4{background-color: rgba(101, 101, 161, 0.842);height: 30px;padding: 10px;margin: 10px;}
</style>
<title>垂直对齐演示</title>
</head>
<body>
<div>
<div class="row justify-content-start">
<div> </div>
<div></div>
<div></div>
</div>
<div class="row justify-content-center">
<div> </div>
<div></div>
<div></div>
</div>
<div class="row justify-content-end">
<div> </div>
## <div></div>
<div></div>
</div>
<div class="row justify-content-around">
<div> </div>
<div></div>
<div></div>
</div>
<div class="row justify-content-between">
<div> </div>
<div></div>
<div></div>
</div>
<div class="row justify-content-evenly">
<div> </div>
<div></div>
<div></div>
</div>
</div>