https://eth-viewer-ff098.web.app/
npm install
npm start
you need to set HTTP and WSS provider url to .env file as below.
example
REACT_APP_HTTP_PROVIDER="https://mainnet.infura.io/v3/PROJECT_ID"
REACT_APP_WSS_PROVIDER="wss://mainnet.infura.io/ws/v3/PROJECT_ID"
npm run build