Why is this site not responsive? Here's how the website looks on a iPhone https://twitter.com/lukew/status/255327150863941632/photo/1/large https://twitter.com/

Why is this site not responsive? Here's how the website looks on a iPhone https://twitter.com/lukew/status/255327150863941632/photo/1/large https://twitter.com/lukew/status/255327150863941632/photo/1/...