green and blue gradient vertical background social template for celebration poster, online banner, business ads, promotion

watercolor web banner abstract template anniversary backdrop design pattern birthday greeting sale blue gradient bright colors business texture canvas celebration background card color copy space creative art graphics digital event events festival festive graphic green layout holiday light marketing poster media modern online paint party invitation promotion post simple social vertical ads works media marketing website digital corporate text layering words insert company banner social post banner online professional promotion fashion party anniversary event celebration festive