First thing that jumped out at me was the "Try CoffeeStrap" button at the bottom isn't obviously a button - of course, the text gives it away if you're reading

First thing that jumped out at me was the "Try CoffeeStrap" button at the bottom isn't obviously a button - of course, the text gives it away if you're reading carefully, but if you're just skimming the site, it's easy to miss entirely. Also, the grey on grey text (like for the "What is this?" header) could be improved, and while not a design issue, I would've liked to see a bit about why you called it CoffeeStrap - seems like a weird name for a service like this - brings to mind a Bootstrap tool for CoffeeScript - never would've expected it to be a language-learning tool.