Different font/website sizes (or "shrinking") with 127.0.0.1 and localhost

Hello,

I opened up this website and used `jekyll serve --watch` as you instructed so that we could see the blog.

The first screen I saw this this:

then I clicked on the homepage text and saw this:

The website seems to shrink, though I can get the first font size's back by using `127.0.0.1` instead of `localhost`.

Do you have a suggested fix for this, or is it something on my end? My information:

- Mac OS X, El Capitan
- Google Chrome Version 58.0.3029.110 (64-bit)
- Output from `ruby -v` is:
`ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin15]`
- Output from `jekyll -v` is:
`jekyll 3.4.3`

EDIT: to clarify, the first screenshot is the output from `http://127.0.0.1:4000/`, and the second scrrenshot is from `http://localhost:4000/` after I clicked on the words "Pixyll" in the upper left corner.