You might want to add some top padding to move the content "box" to move it down from the top of the browser screen so that it looks like it is floating instead of being stuck to the top of the browser window as in my example
http://www.gotfusion.com/BG-inTable/
This can be done as easily as adding a couple of line breaks in the cell of the table code you inserted <br><br> or by adding a spacer gif (clearpixel.gif) with the vertical set to the space you want. Start with 20 and work up or down until you get what looks good to you.