<style>
#demo{
margin: 0 auto;
width: 1000px;
height: 500px;
background: #eee;
overflow: hidden;
/*垂直显示，改变参照物*/
/*-webkit-writing-mode: vertical-rl;*/
/*writing-mode: tb-rl;*/
}
#demo p{
margin:10% 1%;
background: #ccc;
}
</style>
<div id="demo">
<p>我是一个p哦</p>
</div>