A drag and drop interaction

Hello all, I'm fairly new to Storyline and would really welcome your help.

I'd like to create a drag and drop activity where the user drags items to either a green 'helpful' box, or a red 'unhelpful' box.

I would then like the item to take on the colour of the box (change state) and then automatically return to its original position (not to stay in the drop target area). There is no right or wrong at this stage, the user can see their choices as 'helpful' or 'unhelpful' because of the colour they have taken on.

I guess my main question is, how do I get the draggable to change state and take on the relevant colour and how do I get them to return to their original position?

I'd be very grateful for some help! Thanks in advance.