I would recommend using an actual anchor element, and set it as block.
<div class="divBox">
<a href="#">Link</a>
</div>
.divBox
{
width: 300px;
height: 100px;
}
.divBox a
{
width: 100%;
height: 100%;
display: block;
}
This will set the anchor to the same dimensions of the parent div.