Sympy output inconsistent

[zingale]

Describe the bug

context When I include a notebook with SymPy output, sometimes the standard latex font is used and sometimes a larger, uglier font is used for the output.

expectation I expected the fonts to be consistent and more faithfully match what I see when I run the notebook myself (outside of Jupyter book)

bug

Here's an example image:

This notebook is here: https://zingale.github.io/comp_astro_tutorial/advection_euler/euler/euler-eigen.html

it is build via a github action from this repo: https://github.com/zingale/comp_astro_tutorial

Notice that the output from lam[1] is a larger, different font, and in gray, as compared to the output from r[2] just below. Here's an error message I ran into...

problem

This is a problem because the notebook looks inconsistent when rendered with Jupyter book.

Reproduce the bug

go to: https://zingale.github.io/comp_astro_tutorial/advection_euler/euler/euler-eigen.html

you can build this from https://github.com/zingale/comp_astro_tutorial

List your environment

this was built using a github action. Here is the version information:

https://github.com/zingale/comp_astro_tutorial/runs/8285637063?check_suite_focus=true

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