Create something like - https://solfaucet.com/

Hints

• @solana/web3.js provides you with a requestAirdrop function.
• You can get the current users public key using the useWallet hook

export function RequestAirdrop() {
    const wallet = useWallet();
    const { connection } = useConnection();

    async function requestAirdrop() {
        let amount = document.getElementById("amount").value;
        await connection.requestAirdrop(wallet.publicKey, amount * LAMPORTS_PER_SOL);
        alert("Airdropped " + amount + " SOL to " + wallet.publicKey.toBase58());
    }

    return <div>
        <br/><br/>
        <input id="amount" type="text" placeholder="Amount" />
        <button onClick={requestAirdrop}>Request Airdrop</button>
    </div>
}