<div>
<aside><p>ここにテキストが入ります。</p></aside>
</div>

div {
width:100%;
height:auto;
margin:0 0% 0 0;
padding:0 0 0 0%;
}
div > aside {
width:25%;
height:400px;
-webkit-writing-mode: vertical-rl;
-ms-writing-mode: tb-rl;
writing-mode: vertical-rl;
margin:0 auto;
padding:10% 0 0 0;
}
div > aside > p {
width:100%;
height:auto;
color:#615043;
font-size:160%;
font-weight:bold;
line-height:1.2em;
margin:0 auto;
padding:0;
}