so I have this code:

html

```
<div id="wrap">
    <div id="column"></div>
</div>

```

and Css 

```
#wrap {
    display: block;
    height: 2000px;
    width: 400px
}
#column {
    display: block;
    height: 20px;
    width: 20px
}

```

And I want to change #column height when scrolling page.