chapter: 10 : is spinner-border even a tailwind class

[TonyLiVan]

https://github.com/PatrickAlphaC/nextjs-smartcontract-lottery-fcc/blob/main/components/LotteryEntrance.js:

return (

Lottery

{raffleAddress ? (
<>
<button
className="bg-blue-500 hover:bg-blue-700 text-white font-bold py-2 px-4 rounded ml-auto"
onClick={async () =>
await enterRaffle({
// onComplete:
// onError:
onSuccess: handleSuccess,
onError: (error) => console.log(error),
})
}
disabled={isLoading || isFetching}
>
{isLoading || isFetching ? (

) : (
"Enter Raffle"
)}

Entrance Fee: {ethers.utils.formatUnits(entranceFee, "ether")} ETH

The current number of players is: {numberOfPlayers}

The most previous winner was: {recentWinner}

</>
) : (

Please connect to a supported chain

)}

    **<div className="animate-spin spinner-border h-8 w-8 border-b-2 rounded-full"></div>**

is spinner-border even a tailwind class. ? looks like this is a bootstrap class , isn't it ?