Why not have a go at /title ? This command will teach you how to type in rainbow /title - It's similar to /tellraw , but showed in big letters on-screen. /tellraw , on the other hand, it shows up in small words on the left hand side of the screen, Just normal when you type messages to your friends.
Subtitle is first, then title. Just a reminder, lol.
PEEEEEEEEEEAAAAAAAAACCCCCCCCCEEEEEEEEEEE OUUUUUUUUUUUUTTTTTTTTTTT!!!!!!!!!!!!!!!!!!