I would like to get rid of that bad looking box that appears after writing in the "Homepage message"...

Is it possible?

I am just going to add some background music, and I think it sucks having an empty box, just sitting there.

Which empty box? Screenshots please?

If you mean homebox, change the background color of your

Code:

.panel {

to transparent. It will change a fiew things more but it's that color.

Or you can add this to your CSS code:

Code:

.panel div.mes-txt, .panel p {
    display: none;
}

That will get rid of the homepage message box, but it will not get rid of the homepage message title.