Fix the upstream dependency conflict installing NPM packages

It looks like it's a problem with peer dependencies in the latest version of npm (v7) which is still a beta version.

Try with npm install --legacy-peer-deps. For detailed information check the blog post npm v7 Series - Beta Release! And: SemVer-Major Changes in npm v7.

There are two ways:

1. use npm install --legacy-peer-deps to install, and if this doesn't work use

2. the force method. Add --force next to npm install: npm install --force

Use --legacy-peer-deps after npm install. For example, if you want to install Radium, use:

npm install --legacy-peer-deps --save radium

You can follow these commands

First type:

npm config set legacy-peer-deps true

Then type:

npx create-react-app my-app