Hey! By the look of it, there is something wrong with the zoom of your browser. Maybe you zoomed in and then refreshed the page with the scale value larger than 100%?
You know, I just now realize that it's zoomed out like that when I'm on my MacBook Pro's retina display. However when I move the browser window to my standard-resolution display and refresh, the zoom level is fine. So, it's still working! But that may be something you'll want to look into for the future. Thanks!