'react-scripts' is not recognized as an internal or external command,
"scripts": {
"build-css": "node-sass src/ -o src/",
"build-js": "react-scripts build",
"build": "npm run build-css && npm run build-js",
"start-css": "npm run build-css && npm run build-css -- --watch --recursive",
"start-js": "react-scripts start",
"start": "npm-run-all -p start-css start-js",
"test": "react-scripts test --env=jsdom",
"eject": "react-scripts eject"
},