How do I generate master key from the root seed

Southern_Try_1195
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I created a mnemonics and it is hashed using pbdkf2 function and I got a root seed. So this root seed should be hashed again with HMAC-SHA512 to get the master key (Master private key and chain code). So for a HMAC-SAH512 we need a key and data, so in this case what should be the key? Data should be the root seed and what should I give as key in hmac function. I gave "Bitcoin Seed" as key and generated a hash, but it is not matching the output showed in https://iancoleman.io/bip39/ website