Need advice on dynamic website building.

I am pretty new to website building. I had almost no knowledge of html or css before I started watching the treehouse videos. I am now in the process of setting up my site and I have been able to tackle most of the basic challenges: creating divs, placing objects etc. However I haven't able to figure out some of the coding to make it more dynamic. I was hoping someone might have some advice.

I want my page to be behave as follows: When the user arrives at my site there is a thin rectangular div (horizontal) that shows basic information. The concept is a folded up piece of paper you would pull out of an envelope, the top portion containing just the basic information; name, address etc. At the bottom left corner there is a button that says something like (see more). I have been able to make the second page appear by creating a separate page through the link.

However, instead of the lower portion of the page simply 'popping up' I would like it to gradually drop down like a rolling window shade. After that I would like there to be another "see more" button with a same action making the page even larger. Any advice on how this could be achieved?