「Birthday girl」は FontVibe AI で作成したレインボーの文字エフェクトです。鮮やかな多色レインボーグラデーションの文字エフェクトです。滑らかな色の移り変わり、プリズムのような光、そして陽気で色彩豊かなタイポグラフィが特徴です。

rendered as rainbow text effect — COLOR (mandatory): each individual letter must contain a complete ROYGBIV rainbow gradient top-to-bottom within itself — top=red, upper=orange, mid=yellow-green, lower=blue-indigo, bottom=violet. NOT one color per letter. NOT a gradient across the whole word. Every letter is its own complete rainbow. Full chroma Pride flag saturation — not pastel, not muted, not shifted to any single hue. Elegant birthday party venue — dark velvet background with gold and pink balloon arch softly blurred. 'Birthday girl' as rainbow candy balloon letters centered at 72% in 16:9 — each letter complete ROYGBIV rainbow, maximum inflation, brilliant specular highlights. Gold confetti and sparkle lights scattered below. Rose gold and pink party palette. Sweet 16 birthday celebration — letters are the party centerpiece.