This frontend is a demo of how to interact with the staking program deployed to Solana Devnet at address 3pvNETr3Kqf4zTuUmfZUj3QzAHxAXk4icc7F5YsztLar. You can find the code for that sample program here.
Note that both this frontend and the program it invokes are meant for illustrative and educational purposes only and should not be used in a production capacity. They're intentionally simplified for learners and consequently don't include myriad important security and performance measures. Use at your own risk.