Added CSS/HTML files

Hey Quan,

  I'm still fooling around with Git, sorry if i'm sending you so many emails.  It looks like you've mastered this pretty well.  If you're still having any issues with github however, it looks like this video is pretty good.

https://www.youtube.com/watch?v=ifAEho6BmH0&list=PLg7s6cbtAD17uAwaZwiykDci_q3te3CTY&index=2

We should probably also learn how to bring up issues (~31 minutes in the video) so that we can resolve them without having to separately email each other.

Daryl