Paper Wallet Hacked?

So today I’d my nephews baptism and I wanted to come up with a way to gift him ethereum for when he gets older. I created a paper wallet on paperwalletcrypto.com and sent 0.1 eth to the public address (0xcA9A475de7129cF093d27a82E60f9C73c15BfF1A). I did not share the private key with anybody. A few hours later while explaining the wallet to my family, I looked and it appears there was an outgoing transaction that took 99% of the ethereum from that address. I assume I somehow got hacked and the ethereum is gone? Pretty frustrated with this, I’d appreciate any help anybody is able to offer. Maybe I did something wrong, I am not sure.