All in all a nice job! Everything is easy to read, something many beginners have a hard time with.
Just give the form and the input fields in it a max-width. Makes everything look better on big screens.
If you don’t have a widescreen to test it out, search for “devices in Chrome developer tools”, start using the tools as early as possible. (It would be beyond the scope of the reply to introduce the dev tools).
I love the site! As stated already, some more responsiveness would be better, but the colors, layout and spacing is just perfect. Not cluttered or hard to read.