How do I resize this iframe?

How do I make this iframe extend to the gray area, but show the title at the top? Here is my website to understand what I’m talking about:

Also, here is the iframe:

<meta charset="utf-8">
<title>Untitled Document</title>
<iframe style="position:fixed;left:0;top:0;
right:0;bottom:0;overflow:auto;width:100%;height:100%; name="myFrame" frameborder="0"src=""> 

3 posts were merged into an existing topic: How do I make an iFrame the size of my website’s layout?