soft pastel rainbow gradient background with smooth transitions of color

pastelgradient rainbowsoftcolors gradientbackground pastelcolortransition smoothcolorgradient softpastelrainbow gradientdesign pastelbackgroundart softcolorfade rainbowsoftfade gradientart smoothtransitioncolors pastelsoftdesign rainbowgradientbackground softcolorart pastelrainbowart gradientpastelart smoothcolorsart softfadebackground pastelcolorblend rainbowfadeart gradientcolorblend softartpastel pastelrainbowblend colorfadeart smoothpastelart rainbowblendsoft softtransitioncolors pastelfadedesign rainbowblendart pastelsoftblend soft pastel rainbow gradient background smooth transitions color color