Simple html and css code

Hi, this is my very first project. I find difficult to do:

1. Centering the div box and margin it
2. Font styles and margin the text
3. Pick up the best color

I did use pick-up site for colors and fonts but it's not ideal As you can see, the font and color is bit different from the orginal .jpg challenge design. I would love to hear feedback and how could i improve it! Cheers, Daniel.