Multiple Answer Quizzes - Formatting

Hi,

I have a multiple answer quiz (using a pre-built Storyline option), and I want to centre the options in a box.

It seems that the little "Click to add a choice" text option adds extra "space" to the box.

If I try and align the text vertically, then it all goes out of kilter, if I make the box shorter to get rid of this text, then it inserts an annoying right-hand slider bar.

Is there anything I can do, except accept that my box will have a bigger space at the bottom than the top?

Thanks

Bruce