I already did it! What I did was, since you tell me that you need to get the correct CSS selector, I though that I must try. The options were: margin-top and margin-left, and i remember that these parameters allow negative values.
The first thing is that I use the Outer Wraper.
After that i use: margin-top: -20px; and for the boton (right of the form) I use: margin-left: -15px;
I attach a imager in order to you can check the result.