Register Now ! Button Background

Earlier today I edited the Register Now button module, to change the text and link on it.
Problem is I changed the content without toggling the editor. After that, the green background was gone.
I haven't changed any module files other than some images.

My question is, how do I set it back? How do I change its color?

PS:
The code inside the module is:

this is default html

Thank you!
Still, It looks like it is now displaced down (by exactly 17 pixels), overlaping the images...
But I have not edited anything outsite that custom html module!

How do I reposition it back? Do I have to hardcode an offset or something?

It doesn't matter what I change inside the Module, it won't go back to its original place.

As a may-be problematic change, I tried to use the "Select a Background-Image" basic option on the right panel of the module editor, maybe that has something to do with it.

But I can guarantee i haven't edited any .css or php files.

Anyone knows how to fix this displace?

Thanks!

EDIT

I ended up hardcoding a fix for it, as seen in this topic:
www.hotjoomlatemplates.com/support-forum...-link-position-moved

I reassure, I made no changes to any css nor php files, can't understand how the module got displaced...

Because editor inserted <p> ... </p>, when you save from HTML view it does not that taht

It looks like the workaround I used doesn't work every time.
Still, if I save the html content under the html view, joomla still adds the <p> tags...

Well, I simply went into myphpadmin and removed the <p> tags the "bad practice" way. May be bad practice, but looks like it worked.