css实现文字竖直排列 并且在div中居中显示

<dd class="xk"><div class="xkk">血小板</div></dd>
.rdcontent .xkk{display: table-cell;display: table-cell;line-height: 12px;font-size: 12px;height: 50px;vertical-align:middle;}
.rdcontent .xkk{display: table-cell;display: table-cell;line-height: 12px;font-size: 12px;height: 50px;vertical-align:middle;}