CodeSandbox(CSB) is an online React playground. One of the ways to add a project there is through importing from GitHub. Please sign in via GitHub.
This article will walk through the steps of sync'ing a create-react-app (CRA) project on a GitHub repo with a sandbox.
First, a quick recap of how to use CRA;
>> npm i -g create-react-app
>> create-react-app cra-app