IS Lesson 4 reflection:CSS

I learned about CSS last week, and I found it very complex at first, although it is rather interesting. However, after learning about css for a while, I realized that css was not as complex I thought. Sure, there are many attributes to remember but you do not have to remember them. After all, you can just search them up. What I found complex at first was in the structure of the code. But then, I realized it was actually quite simple. You just needed a name, then its value. This is rather interesting. At first, I was also confused because the css tutorial at www.w3schools.com said something that a comment in a css does not contribute to it, just made things organized. I did not really know that at first so I thought "what is the comment used for since it does nothing?" As I started reading more about css, I started finding that it was actually quite easy. Another thing that confused me at first was some of its differences with html, such as ";", and "}". However, after writing part of a css code structure, I begin getting used to it. The only question that I have now is why does my bottom-margin:"...", float:bottom, attributes not work? It seems that there is no bottom margin in my web page at all. Also, another thing that confused me was the margin and the border. w3 schools stated that the background does not affect the margin but in my web page, I had a border, and a background around it! How can that be?