Oh come on, are you serious? The site is not intended for web developers who "learn about web dev on their phones". It's an interactive demonstration where you

Oh come on, are you serious? The site is not intended for web developers who "learn about web dev on their phones". It's an interactive demonstration where you can see and learn about all that flexbox can do. And it's done very well. The presentation makes use of multiple panels you need to see at once. Please don't make foolish comments about it not working on a phone. Tip: put your phone down. Grab yourself a computer of some description, at the very least a laptop. Take another look at flexboxin5 because it's really good.