Modal resizes dynamically, but other divs don't move with it

I am not sure if I worded the title correctly.

I have a fiddle here...

When the content inside the <div> forces it to resize, the "I have read this message" button doesn't move with it. I have the height on the <div> set to auto, so I'm not sure what else there would be...

Here's the CSS for the modal window...

.reveal-modal {
    visibility: hidden;
    top: 100px; 
    left: 43%;
    margin-left: -360px;
    width: 700px;
    height: auto;
    background: #eee url(../images/modal-gloss.png) no-repeat -200px -80px;
    position: absolute;
    z-index: 101;
    padding: 10px 60px 34px 180px;
    -moz-border-radius: 5px;
    -webkit-border-radius: 5px;
    border-radius: 5px;
    -moz-box-shadow: 0 0 10px rgba(0,0,0,.4);
    -webkit-box-shadow: 0 0 10px rgba(0,0,0,.4);
    -box-shadow: 0 0 10px rgba(0,0,0,.4);
    behavior: url(pie/PIE.htc);
    }

Solution

Remove top:275px; and add bottom: 0px; instead in close-reveal model

And add this div

   <div style="position: relative;">
   <a class="close-reveal-modal"></a>
   </div>