竖向排列：writing-mode: vertical-rl;
竖向里面设置数字横向排列：text-combine-upright: all;
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title></title>
<style type="text/css">
div{writing-mode: vertical-rl;letter-spacing: 1px;}
div b{text-combine-upright: all;margin: 5px 0;}
</style>
</head>
<body>
<div>
<p>一一</p>
<p>二二</p>
<p>三三</p>
<p>四四<b>1729</b>年</p>
<p>五五</p>
<p>六六</p>
</div>
</body>
</html>示例：
.code{
position: absolute;
top:-16px;
right:0;
height:100%;
width:16px;
color:#fff;
font-size: 12px;
line-height: 12px;
text-align: center;
writing-mode: vertical-lr;
box-sizing: border-box;
padding:0 0 0 2px;
letter-spacing:0.3em;
}