This is the classic war poster "Keep Calm and Carry On" reworded to "Keep Calm and Party On". There are silhouettes of fireworks/sparklers around the words. It's a happy fun design that makes beautiful gifts, party invitations or decorations.
I've put this on a blue background, but you can change that really easily. Hit 'Customize it' and then 'edit', and you'll be able to change to absolutely ANY color you prefer.