```
PROVIDER_URL=https://mainnet.infura.io/v3/YOUR_INFURA_KEY
PORT=3000
MASTER_WALLET=0xYourMasterWalletAddress
```

To complete the setup:

1. Install Node.js if you haven't already
2. Create a new directory for the project
3. Add all the files above
4. Run `npm install` to install dependencies
5. Create a free Infura account and replace YOUR_INFURA_KEY in .env
6. Start the server with `npm start`

The application now has:
- Frontend with working wallet connection via MetaMask
- Backend API for wallet creation and balance checking
- Proper Ethereum integration
- Light blue accents as requested in previous changes

To use:
1. Install MetaMask browser extension
2. Open index.html in browser
3. Click "Connect Wallet" to connect your Ethereum wallet
4. The backend can be accessed at http://localhost:3000/api/create-wallet to generate new wallets