a vivid rainbow gradient background with vertical stripes and smooth transitions between colors.

rainbow gradient vivid colorful vertical stripes dynamic artistic digital creative background spectrum multicolor bright smooth hues abstract design visual captivating rich blending bold energy light brightness neon chromatic colorfulness decoration festive lively illuminated radiant striking electric rainbowgradient gradientart multicolored rainbowhues colortransition textile fabric waves soft flowing textured seamless ai generated