Beauty is subjective, some people like the style in the linked page, others not. Personally i like the default fonts and colors (at least on Windows, i think on

Beauty is subjective, some people like the style in the linked page, others not. Personally i like the default fonts and colors (at least on Windows, i think on Linux the default font sizes are a bit large) but not everyone does. Besides this is just fashion, the defaults were chosen because at some point people found them beautiful, but over time they simply fell out of fashion. Nowadays they're there mainly to avoid breaking sites that do not override them.