While basic, the tangibility and interactivity this provides would promote flexbox to a lot of people who would otherwise shy away from it. Definitely a concep

While basic, the tangibility and interactivity this provides would promote flexbox to a lot of people who would otherwise shy away from it. Definitely a concept worth throwing at /r/css, /r/webdesign, places like that... after it's been tidied up a little. It's still rough around the edges: the thick dashed borders and color scheme could do with a little polish; text and image blocks (both customizable and lorem-ipsum/stock-image-based) would be great; adjusting margin/padding would be a good idea; and being able to add arbitrary CSS declarations (like font-family, color, background, etc) would be good too.