This pool party birthday invitation is set in the language of a hand-drawn summer poster: fluid script lettering, a sunny yellow floatie ring, bubblegum-pink splashes and rising bubbles in pool blue. The guest page carries the same hand-inked world — the countdown cells sit on foam-blue tiles with a foamy water line, the divider between sections is a cresting wave, and the reply area is stamped with a hand-lettered admission pass above a solid yellow reply button. It is built for a kids' summer birthday, a backyard splash day, or any warm-weather celebration where the party is the pool. Every field a host would change — the honoree's name, date, time, venue, dress code, parking note and the host's message — is editable before publishing, and the page never presumes a specific venue, so it works whether the splash happens at home or at a rented pool. Guests get a live countdown to the big splash, a location block with directions and add-to-calendar buttons, and a reply form reachable in one tap from the sticky navigation. The palette of pool blue, sunny yellow and bubblegum pink is drawn straight from the card art, so the invitation, the page and the event feel like one design. Pair the look with striped pool towels and ring-buoy party favors for the full effect.