Not bad. First design revision looks like back when css round corners and opacity became usable. Next one looks like the usual "I'm a designer" design. The grey one reminds me of Yahoo's early days when grey backgrounds were popular. The the last one is minimal and clean, so rather modern. Not a big fan of this particular green though.

I think it's great when people work with the feedback they get and decide to act on it.

I have to admit though I was a little surprised this post was about simple frontend design/HTML/CSS, I was expecting something more... techy.