Plan a birthday that goes under the sea with a mermaid-themed invitation built from a turquoise lagoon palette, bubble pink accents, and hand-drawn details. The guest page opens like a sunny day at the water's edge: a bright watery backdrop, rising bubbles with glossy highlights, soft shafts of light, and shimmering specks drifting across the screen. The honoree's name is set in a big rounded display face in deep ocean ink, with a gradient lagoon banner above it and the milestone age as a playful tilted numeral in bubble pink. Every section wears the sticker style of a scrapbook page: the details card lists date, time, venue, and dress code in foam-colored rows; a shell-shaped stamp marks the countdown, whose four cells tick in sticker tiles; and the RSVP closes the page on a turquoise button ringed by a stamp frame. Hand-drawn wave seams draw themselves between the sections, the bubbles pop when tapped, and a soft crayon-style grain gives the whole page the feel of a handmade card. Perfect for a 5th birthday, a mermaid or under-the-sea theme party, a poolside bash, or any little one who loves the ocean. Hosting details, the map, and the RSVP form personalize in seconds, and the page plays beautifully on phones, where every animation is reduced-motion safe.