Read the instructions - they are very specific:
Add five divider elements to the body element.
You don't have that: you have a body element containing one DIV tag, and a total of five
nested DIV tags:
<div>
<div>
<div>
<div>
<div>
</div>
</div>
</div>
</div>
</div>
That's not the same as this:
<div>
</div>
<div>
</div>
<div>
</div>
<div>
</div>
<div>
</div>
And so on.
Make sense?