Camera movement(I have no clue how to code)

So Im making this Quiz-game for my friends. I have a start menu where it stands "Press Space to start".

Here is my problem. I need a code that move the Main Camera down a bit after they press Space. I can deal with the numbers when it comes to how far down the camera needs to go.

My other codes are in JavaScript if that plays a role. I can understand a code when I look at it, but I cant create one myself. :S

Thanks in advance. :)