Align Div at bottom on main Div

.vertical_banner {
    border: 1px solid #E9E3DD;
    float: left;
    height: 210px;
    margin: 2px;
    padding: 4px 2px 10px 10px;
    text-align: left;
    width: 117px;
    position:relative;
}

#bottom_link{
   position:absolute;                  /* added */
   bottom:0;                           /* added */
   left:0;                           /* added */
}

<div class="vertical_banner">
    <div id="bottom_link">
         <input type="submit" value="Continue">
       </div>
</div>