实现文字底部居中

.txt{ 
 
 height:300px;
 width:300px;
 border:1px solid #333333;
 text-align:center;
 position:relative 
 
}
.txt p{
 position:absolute;
 bottom:0px;
 padding:0px;
 margin:0px
}

<div class="txt">
    <p>我是来靠底部的。。。。。。</p>
</div>