Acidic poster gradient

Quick answer：

An 'Acidic poster gradient' refers to a visual design technique often used in graphic design, where the background of a poster or image gradually transitions from one color to another, creating a vibrant and eye-catching effect. This technique is reminiscent of the 'acid trip' aesthetic, characterized by bold colors, intense contrasts, and surrealistic patterns. It is commonly used in modern graphic design to evoke a sense of energy, vibrancy, or a futuristic vibe.