Great job! I'm also in favor of slight adjustments to make the color scheme a bit less aggressive. But overall: super neat!
While I do like the explanation text under "What is Gridcoin?" ... may I suggest to insert a "easy-as-one-two-three" kind of summary before that?
Something along the lines of:
- Simply install the Gridcoin wallet and use a trusted exchange to become an investor.
- As a Gridcoin miner, you get crypto currency for supporting ongoing distributed computing projects.
- With Gridoin, the electricity that is needed to run the network does something good in addition to providing a crypto-currency.
Let's earn money for supporting science.
This way we could have a really simple summary before visitors get confronted with the slightly technical "What is Gridcoin" text body as it is now.
Since this is more helpful and I have to live up to my user name here: I created a pull-request.