If I have division with `height: 100px;` and it contains a link inside - can I make link fill the height of the division without hard-coding the value?

`<div><a href="#">hello</a></div>`

```
div {
    height: 100px;
    width: 100px;
    background: red;
}

a {
    background: green;
    height: 100%; /* This does not work. Is it possible to set this height to 100% of container? */
}

```

Fiddle: <http://jsfiddle.net/nPL65/>