Unfortunately the image you uploaded is really small so I can't read it.
In answer to your question, yes, it is the yellow book by Ethan
Something is definitely amiss though.
What I find is at the point where the media query kicks in, the width (and navigation bar) expands a bit on my screen.
where I am running at a fixed width of 700px above 768 resolution, at the point where the viewport changes, the page width on my browser increases to about 784px, (which is 90% of the window).
If the window was truly 768px, then 90% is just under 700px, and the scaling would be virtually seamless, do you see what I mean ?
The only way I can get it to behave om my browser is set the page width to 82%.
As an aside, navigation -
if i look at the page on my tablet in I get the 2 column layout, as expected, (1080 (landscape) or 800 px (portrait) resolution) but the navigation has started to wrap, in either mode
on my desktop, in chrome, the navigation doesn't wrap until I get a lot narrower, and after display is single column.
if i can get some consistency, it would help me a bit, but I'm a bit in the dark at the moment.
-on the plus side, I have learned how to do a screen dump from my tablet !
I think I may need to start again with a blank canvas and find out at what point it starts playing up