this version will run with npm start, but when attempting to run the built version behind nginx, it appears to have issues
Browserslist 
The config to share target browsers and Node.js versions between different front-end tools. It is used in:
- Autoprefixer
- Babel
- postcss-preset-env
- eslint-plugin-compat
- stylelint-no-unsupported-browser-features
- postcss-normalize
- obsolete-webpack-plugin
All tools will find target browsers automatically,
when you add the following to package.json:
"browserslist": [
"defaults",
"not IE 11",
"maintained node versions"
]
Or in .browserslistrc config:
# Browsers that we support
defaults
not IE 11
maintained node versions
Developers set their version lists using queries like last 2 versions
to be free from updating versions manually.
Browserslist will use caniuse-lite with Can I Use data for this queries.
Browserslist will take queries from tool option,
browserslist config, .browserslistrc config,
browserslist section in package.json or environment variables.
Docs
Read full docs on GitHub.