I give you full credit in the about page. I've made some minor tweaks, and assumed it wouldn't be a problem as you open sourced it. Was certainy not my intention to offend. Happy to change if it'd make you happy.
Don't worry too much about it though because I have since changed the design of my website. You were not the first to just copy the design. I would however prefer it a lot if you changed the design.
But I'm curios, why would you prefer he change it? It is a very barebones stylesheet, nice typographical choices but at the end of the day this is hardly a unique design.
And thank you for Flask and other goodies. :)